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A322500 Number of tilings of a 7 X n rectangle using V (2m+1)-ominoes (m >= 0) in standard orientation. 2
1, 1, 21, 257, 2989, 34468, 396500, 4577274, 52338705, 600923375, 6897569624, 79170705722, 908721438900, 10430285080567, 119719520002653, 1374133015203548, 15772280213569812, 181033948036338279, 2077904397828614231, 23850149155575310594, 273751580233289217307 (list; graph; refs; listen; history; text; internal format)
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: A036220 A022649 A165094 * A241632 A323972 A125433

Adjacent sequences:  A322497 A322498 A322499 * A322501 A322502 A322503

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Dec 12 2018

STATUS

approved

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Last modified May 21 19:31 EDT 2019. Contains 323444 sequences. (Running on oeis4.)