A366020 - OEIS

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A366020

Number of polyominoes in which every cell has coprime coordinates.

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

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OFFSET

1,3

LINKS

Table of n, a(n) for n=1..17.

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

Cf. A000105, A347521, A294151.

Sequence in context: A317911 A374301 A151889 * A294151 A294566 A129873

Adjacent sequences: A366017 A366018 A366019 * A366021 A366022 A366023

KEYWORD

nonn,more,hard

AUTHOR

Ludovic Schwob, Sep 26 2023

STATUS

approved