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

Author

Alois P. Heinz, Nov 29 2014

Keywords

• nonn

Links

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

Crossrefs

Column k=4 of A251072.

Cf. A236582.