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A251074 Number of tilings of a 12 X n rectangle using 3n tetrominoes of shape I. 4
1, 1, 1, 1, 26, 75, 154, 269, 1732, 5764, 15131, 34345, 135950, 462186, 1356284, 3539433, 11681091, 38519022, 118366429, 334591568, 1037603086, 3309045401, 10296063522, 30414763937, 92735958046, 289374852696, 899439481823, 2716896548850, 8270384213984 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
Wikipedia, Tetromino
CROSSREFS
Column k=4 of A251072.
Cf. A236582.
Sequence in context: A044164 A044545 A255185 * A304657 A262221 A139698
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 29 2014
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)