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A273477
Number of tilings of a 7 X n rectangle using pentominoes of shapes W, U, X and monominoes.
2
1, 1, 23, 1086, 13097, 261110, 5732276, 105028302, 2057123951, 40750196324, 789214306848, 15416490294168, 301533431477968, 5881271193704355, 114836714153318686, 2242611029205195253, 43780084385383228801, 854790034707804119211, 16689735991827528511674
OFFSET
0,3
LINKS
Wikipedia, Pentomino
CROSSREFS
Cf. A264765.
Sequence in context: A042012 A128404 A126741 * A202656 A367772 A340487
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 23 2016
STATUS
approved