The On-Line Encyclopedia of Integer Sequences (OEIS)

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Revision History for A366020

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A366020

Number of polyominoes in which every cell has coprime coordinates.
(history; published version)

#7 by Michael De Vlieger at Fri Sep 29 08:27:39 EDT 2023

STATUS

reviewed

approved

#6 by Joerg Arndt at Fri Sep 29 03:52:32 EDT 2023

STATUS

proposed

reviewed

#5 by Michel Marcus at Tue Sep 26 09:47:37 EDT 2023

STATUS

editing

proposed

#4 by Michel Marcus at Tue Sep 26 09:47:24 EDT 2023

CROSSREFS

Cf. A000105, A347521, A294151.

STATUS

proposed

editing

Discussion

Tue Sep 26

09:47

Michel Marcus: as explained in edit page : Give cross-references to other sequences:
Example: Cf. A987654, A987655.

#3 by Ludovic Schwob at Tue Sep 26 09:22:56 EDT 2023

STATUS

editing

proposed

#2 by Ludovic Schwob at Tue Sep 26 09:22:16 EDT 2023

NAME

allocated for Ludovic SchwobNumber of polyominoes in which every cell has coprime coordinates.

DATA

1, 1, 2, 3, 8, 13, 36, 76, 201, 476, 1218, 2952, 7282, 17566, 42657, 102931, 249119

OFFSET

1,3

EXAMPLE

For n = 9, the only polyomino from A294151 which does not belong to this sequence is the following, because it has always one cell whose coordinates are both divisible by 3 :

|#|#|#|

|#| |#| |#|

|#|#|#|

CROSSREFS

A000105, A347521, A294151

KEYWORD

allocated

nonn,more,hard

AUTHOR

Ludovic Schwob, Sep 26 2023

STATUS

approved

editing

#1 by Ludovic Schwob at Tue Sep 26 09:22:16 EDT 2023

NAME

allocated for Ludovic Schwob

KEYWORD

allocated

STATUS

approved