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Fractal triangle whose virtual skeleton is a polyedge as the Y-toothpick structure of A160120.
(history; published version)

#6 by N. J. A. Sloane at Wed Feb 24 02:48:18 EST 2021

LINKS

David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://neilsloane.com/docA000695/tootha000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

Discussion

Wed Feb 24

02:48

OEIS Server: https://oeis.org/edit/global/2889

#5 by N. J. A. Sloane at Tue Nov 27 18:35:51 EST 2018

LINKS

David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://neilsloane.com/doc/tooth.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

Discussion

Tue Nov 27

18:35

OEIS Server: https://oeis.org/edit/global/2774

#4 by Charles R Greathouse IV at Sat Sep 26 01:17:08 EDT 2015

LINKS

N. J. A. Sloane, <a href="http://neilsloane.com/docwiki/toothlist.htmlCatalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

Discussion

Sat Sep 26

01:17

OEIS Server: https://oeis.org/edit/global/2460

#3 by Charles R Greathouse IV at Thu Oct 04 10:29:11 EDT 2012

LINKS

David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://www.research.attneilsloane.com/~njas/doc/tooth.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>

N. J. A. Sloane, <a href="http://www.research.attneilsloane.com/~njas/doc/toothlist.html">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

Discussion

Thu Oct 04

10:29

OEIS Server: https://oeis.org/edit/global/1833

#2 by Russ Cox at Fri Mar 30 17:34:00 EDT 2012

AUTHOR

_Omar E. Pol (info(AT)polprimos.com), _, Jun 17 2009

Discussion

Fri Mar 30

17:34

OEIS Server: https://oeis.org/edit/global/157

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

Fractal triangle whose virtual skeleton is a polyedge as the Y-toothpick structure of A160120.

DATA

0, 9, 33, 57, 123, 147

OFFSET

0,2

COMMENTS

Number of ON states after n generations of cellular automaton based on the infinite triangular grid.

LINKS

David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://www.research.att.com/~njas/doc/tooth.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>

N. J. A. Sloane, <a href="http://www.research.att.com/~njas/doc/toothlist.html">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

CROSSREFS

Cf. A139250, A160120, A161341, A161342, A161343.

KEYWORD

more,nonn

AUTHOR

Omar E. Pol (info(AT)polprimos.com), Jun 17 2009

STATUS

approved