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A278456
Number of tilings of a 5 X n rectangle using pentominoes of any shape and monominoes.
6
1, 2, 50, 1954, 56864, 1532496, 42238426, 1178422563, 32890293494, 917103556607, 25552076570350, 711923354658732, 19838824712825618, 552851181380560869, 15406086995815163663, 429312063890812931103, 11963383230714027535776, 333377000620725693771782
OFFSET
0,2
LINKS
Wikipedia, Pentomino
EXAMPLE
a(1) = 2:
._. ._.
|_| | |
|_| | |
|_| | |
|_| | |
|_| |_| .
CROSSREFS
Column k=5 of A278657.
Sequence in context: A246071 A367777 A088920 * A231043 A356611 A079198
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 22 2016
STATUS
approved