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A263425 Number of tilings of an 2n X 2n square using tetrominoes of any shape. 1
1, 1, 117, 178939, 19077209438, 72713560548906621 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..5.

S. Butler, J. Ekstrand, S. Osborne, TETRIS Tiling, AMS Spring Central Sectional, Iowa State University, April 27-28 2013

R. S. Harris, Counting Polyomino Tilings

Wikipedia, Tetromino

FORMULA

a(n) = A230031(2n,2n).

CROSSREFS

Bisection (even part) of main diagonal of A230031.

Cf. A004003.

Sequence in context: A079196 A113798 A151593 * A066923 A039556 A095627

Adjacent sequences:  A263422 A263423 A263424 * A263426 A263427 A263428

KEYWORD

nonn,more

AUTHOR

Alois P. Heinz, Oct 17 2015

STATUS

approved

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Last modified April 23 13:51 EDT 2021. Contains 343204 sequences. (Running on oeis4.)