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A270071 Number of tilings of an n X n square using monominoes and trominoes of any shape. 1
1, 1, 5, 93, 7517, 2501946, 3473827027, 19823918037604, 466326405037190729, 45283517791861200639757, 18137923612752525595542410804, 29967243098804386765778629249653298, 204247259656641635611144023845458294818885 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..12.

Wikipedia, Tromino

CROSSREFS

Main diagonal of A270061.

Sequence in context: A012784 A015030 A136097 * A047052 A049662 A264176

Adjacent sequences:  A270068 A270069 A270070 * A270072 A270073 A270074

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 09 2016

STATUS

approved

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Last modified August 3 13:59 EDT 2021. Contains 346438 sequences. (Running on oeis4.)