A251074 Number of tilings of a 12 X n rectangle using 3n tetrominoes of shape I.

1, 1, 1, 1, 26, 75, 154, 269, 1732, 5764, 15131, 34345, 135950, 462186, 1356284, 3539433, 11681091, 38519022, 118366429, 334591568, 1037603086, 3309045401, 10296063522, 30414763937, 92735958046, 289374852696, 899439481823, 2716896548850, 8270384213984

Offset

0,5

Links

Alois P. Heinz, Table of n, a(n) for n = 0..1000

Wikipedia, Tetromino

Crossrefs

Column k=4 of A251072.

Cf. A236582.

Sequence in context: A044164 A044545 A255185 * A304657 A262221 A139698

Adjacent sequences: A251071 A251072 A251073 * A251075 A251076 A251077

Keyword

nonn

Author

Alois P. Heinz, Nov 29 2014

Status

approved