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A322473 Number of tilings of a 20 X n rectangle using 2*n copies of the disconnected shape [ooooo     ooooo]. 5
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 8, 17, 28, 41, 56, 144, 240, 344, 456, 576, 712, 856, 1008, 1168, 1336, 1625, 2069, 2708, 3588, 4761, 7705, 12796, 20588, 31689, 46761, 73081, 111213, 162897, 229969, 314361, 421416, 555737, 723341, 931537, 1189140 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,16

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..7011

D. E. Knuth, Dancing Links, 24th Annual Christmas Lecture, Stanfordonline video (2018)

D. E. Knuth, Dancing Links, arXiv:cs/0011047 [cs.DS], 2000.

Wikipedia, Dancing Links

CROSSREFS

Cf. A320437, A323352, A323483, A323423.

Sequence in context: A056121 A264355 A028884 * A247117 A099358 A077222

Adjacent sequences:  A322470 A322471 A322472 * A322474 A322475 A322476

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jan 16 2019

STATUS

approved

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Last modified November 27 16:34 EST 2021. Contains 349394 sequences. (Running on oeis4.)