A030445 - OEIS

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A030445

Number of one-sided n-celled polyknights.

1, 2, 8, 68, 550, 5328, 52484, 534793, 5513338, 57494308, 604212943, 6392547793, 68014392915

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OFFSET

1,2

COMMENTS

A polyknight is a variant of a polyomino in which two tiles a knight's move apart are considered adjacent. A polyknight need not be connected in the sense of a polyomino.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

The 2 polyknights with 2 cells:

X.. ..X

..X X..

The 8 polyknights with 3 cells:

X. X.. X.. X... X.X .X. .X. X...

.. ... ..X .... ... X.. ..X ...X

.X .X. ... .X.. .X. ..X X.. .X..

.. ... .X. ...X

X. ..X

CROSSREFS

Cf. A030444, A030446, A030447, A030448.

Sequence in context: A202553 A023164 A053922 * A093990 A361213 A156448

Adjacent sequences: A030442 A030443 A030444 * A030446 A030447 A030448

KEYWORD

nonn,nice,more

AUTHOR

David W. Wilson

EXTENSIONS

Corrected and extended by Joseph Myers, May 21 2004

a(12)-a(13) from John Mason, Jan 13 2023

STATUS

approved