A322500 Number of tilings of a 7 X n rectangle using V (2m+1)-ominoes (m >= 0) in standard orientation.

1, 1, 21, 257, 2989, 34468, 396500, 4577274, 52338705, 600923375, 6897569624, 79170705722, 908721438900, 10430285080567, 119719520002653, 1374133015203548, 15772280213569812, 181033948036338279, 2077904397828614231, 23850149155575310594, 273751580233289217307

Offset

0,3

Comments

The shapes of the tiles are:

._.

._. | |

._. | | | |

._. | |_. | |_._. | |_._._.

|_| |___| |_____| |_______| ... .

Links

Alois P. Heinz, Table of n, a(n) for n = 0..944

Wikipedia, Polyomino

Crossrefs

Column k=7 of A322494.

Sequence in context: A165094 A365849 A360804 * A241632 A323972 A125433

Adjacent sequences: A322497 A322498 A322499 * A322501 A322502 A322503

Keyword

nonn

Author

Alois P. Heinz, Dec 12 2018

Status

approved