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A251075
Number of tilings of a 18 X n rectangle using 3n hexominoes of shape I.
3
1, 1, 1, 1, 1, 1, 43, 117, 229, 385, 591, 853, 5789, 17163, 40521, 84211, 160143, 284639, 945352, 2743255, 7017326, 16250983, 34801374, 69959957, 179843441, 479965811, 1238082783, 3015746329, 6925030997, 15065972891, 35869626723, 89673470947, 226122534275
OFFSET
0,7
LINKS
Wikipedia, Hexomino
CROSSREFS
Column k=6 of A251072.
Cf. A250663.
Sequence in context: A138695 A297412 A282294 * A248018 A262491 A029816
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 29 2014
STATUS
approved