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A353777
Number of tilings of an n X n square using dominoes, monominoes and 2 X 2 tiles.
3
1, 1, 8, 163, 15623, 5684228, 8459468955, 50280716999785, 1202536689448371122, 115462301811597894998929, 44537596159273736617786474211, 69003082378039459280864860681919942, 429429579883061866326542598342441907826951, 10734684843612889640707750537898705644071715970757
OFFSET
0,3
LINKS
Wikipedia, Polyomino
FORMULA
a(n) = A352589(n,n).
EXAMPLE
a(2) = 8:
.___. .___. .___. .___. .___. .___. .___. .___.
| | |_|_| |___| | | | |_|_| |___| |_| | | |_|
|___| |_|_| |___| |_|_| |___| |_|_| |_|_| |_|_| .
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 07 2022
STATUS
approved