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A233340
Number of tilings of a 5 X 3n rectangle using 5n trominoes of any shape.
3
1, 62, 8342, 1269900, 198253934, 31111319376, 4887323351972, 767919868804309, 120664440361104580, 18960353496615710993, 2979300461790704311162, 468147088780110777732830, 73561466714064126023807694, 11558951424929920406557632356, 1816295465197137076501207582877
OFFSET
0,2
LINKS
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
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 07 2013
STATUS
approved