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A247218 Number of tilings of a 15 X n rectangle using 3n pentominoes of shape I. 3
1, 1, 1, 1, 1, 34, 95, 190, 325, 506, 3324, 10353, 25607, 55346, 108756, 389216, 1208901, 3281686, 8006108, 17950204, 51430928, 150609259, 419540401, 1090827453, 2651884943, 7077981621, 19691707908, 54499735145, 145671654672, 371632691473, 976543067070 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

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

Wikipedia, Pentomino

CROSSREFS

Cf. A174249, A233427, A003520, A247117.

Column k=5 of A251072.

Sequence in context: A202421 A202414 A160062 * A233031 A233028 A044221

Adjacent sequences:  A247215 A247216 A247217 * A247219 A247220 A247221

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 26 2014

STATUS

approved

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Last modified April 7 01:11 EDT 2020. Contains 333291 sequences. (Running on oeis4.)