A247775 Number of tilings of a 5 X n rectangle using n pentominoes of any but the X shape.

1, 1, 5, 55, 493, 3930, 27207, 207118, 1622723, 12544364, 95912510, 732066083, 5616480627, 43128778000, 330817187318, 2536012919124, 19443866141395, 149118307026576, 1143608532988558, 8769818352137034, 67250342436670138, 515711365536657077, 3954797365004436075

Offset

0,3

Links

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Pentomino

Crossrefs

Column k=0 of A247711.

Cf. A174249, A233427.

Sequence in context: A081300 A190543 A144894 * A045640 A043040 A342420

Adjacent sequences: A247772 A247773 A247774 * A247776 A247777 A247778

Keyword

nonn

Author

Alois P. Heinz, Sep 23 2014

Status

approved