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A006253 Number of perfect matchings (or domino tilings) in C_4 X P_n.
(Formerly M1926) 		+0
7
1, 2, 9, 32, 121, 450, 1681, 6272, 23409, 87362, 326041, 1216800, 4541161, 16947842, 63250209, 236052992, 880961761, 3287794050, 12270214441, 45793063712, 170902040409, 637815097922, 2380358351281, 8883618307200, 33154114877521, 123732841202882 (list; graph; listen)
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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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