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A270067
Number of tilings of a 7 X n rectangle using monominoes and trominoes of any shape.
2
1, 9, 1371, 148796, 15913695, 1707101599, 184140417890, 19823918037604, 2133436326533143, 229681994753502100, 24725866354382952217, 2661724100255128134369, 286536699674194768262220, 30845921492404301091244774, 3320584102598070051873302366
OFFSET
0,2
LINKS
Wikipedia, Tromino
CROSSREFS
Column k=7 of A270061.
Sequence in context: A076442 A076704 A117053 * A213448 A120347 A230172
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Mar 09 2016
STATUS
approved