A233340 Number of tilings of a 5 X 3n rectangle using 5n trominoes of any shape.

1, 62, 8342, 1269900, 198253934, 31111319376, 4887323351972, 767919868804309, 120664440361104580, 18960353496615710993, 2979300461790704311162, 468147088780110777732830, 73561466714064126023807694, 11558951424929920406557632356, 1816295465197137076501207582877

Offset

0,2

Links

Alois P. Heinz, Table of n, a(n) for n = 0..400

Alois P. Heinz, G.f. for A233340

Wikipedia, Tromino

Formula

G.f.: see link above.

Crossrefs

Trisection of column k=5 of A233320.

Sequence in context: A056639 A289297 A123806 * A299826 A209905 A227357

Adjacent sequences: A233337 A233338 A233339 * A233341 A233342 A233343

Keyword

nonn

Author

Alois P. Heinz, Dec 07 2013

Status

approved