A251073 - OEIS

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A251073

Number of tilings of a 9 X n rectangle using 3n trominoes of shape I.

3

1, 1, 1, 19, 57, 121, 783, 2861, 8133, 37160, 143419, 468816, 1876855, 7263468, 25496863, 97187247, 372086645, 1352780401, 5071962134, 19220628318, 71025008365, 265095817718, 997839772024, 3713274525679, 13851695644227, 51940567251136, 193830054345968

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

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

Alois P. Heinz, G.f. and Maple program for A251073

Wikipedia, Tromino

FORMULA

G.f.: see link above.

MAPLE

# see link above.

CROSSREFS

Column k=3 of A251072.

Sequence in context: A367518 A093362 A341176 * A176413 A263336 A061973

Adjacent sequences: A251070 A251071 A251072 * A251074 A251075 A251076

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 29 2014

STATUS

approved