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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
OFFSET
0,6
LINKS
Wikipedia, Pentomino
CROSSREFS
Column k=5 of A251072.
Sequence in context: A365248 A202414 A160062 * A233031 A233028 A044221
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 26 2014
STATUS
approved