A278456 Number of tilings of a 5 X n rectangle using pentominoes of any shape and monominoes.

1, 2, 50, 1954, 56864, 1532496, 42238426, 1178422563, 32890293494, 917103556607, 25552076570350, 711923354658732, 19838824712825618, 552851181380560869, 15406086995815163663, 429312063890812931103, 11963383230714027535776, 333377000620725693771782

Offset: 0

Author

Alois P. Heinz, Nov 22 2016

Keywords

• nonn

Examples

			a(1) = 2:
._.   ._.
|_|   | |
|_|   | |
|_|   | |
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|_|   |_|  .
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..692
• Wikipedia, Pentomino

Crossrefs

Column k=5 of A278657.

Cf. A174249, A233427, A273477.