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

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Tromino

CROSSREFS

Column k=7 of A270061.

Sequence in context: A076442 A076704 A117053 * A213448 A120347 A230172

Adjacent sequences:  A270064 A270065 A270066 * A270068 A270069 A270070

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 09 2016

STATUS

approved

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Last modified January 24 07:18 EST 2020. Contains 331189 sequences. (Running on oeis4.)