A213378 - OEIS

A213378

Number of polyominoes of order 2n that can be tiled by dominoes in more than one way.

0, 1, 3, 41, 499, 6946, 95964, 1330807, 18395673

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OFFSET

1,3

COMMENTS

Tilings related by a symmetry of the polyomino that is not a symmetry of the tiling count as distinct (thus, the square tetromino counts as being tiled in two distinct ways).

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Cf. A056785, A056786, A213376, A213377.

Sequence in context: A328509 A087544 A305667 * A189356 A155672 A073844

Adjacent sequences: A213375 A213376 A213377 * A213379 A213380 A213381

KEYWORD

hard,more,nonn

AUTHOR

Joseph Myers, Jun 10 2012

STATUS

approved