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A232759 Number of tilings of a 7 X 4n rectangle with 7n tetrominoes of any shape. 2
1, 9157, 657253434, 58480141962875, 5316709999497259059, 484393789403397886429249, 44141190389848159904786733934, 4022519784390988451174562198889336, 366566828291367228800261059891047626895, 33404748935117787113145811582089363383972226 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..70

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, Tetris

Wikipedia, Tetromino

CROSSREFS

Quadrisection of column k=7 of A230031.

Sequence in context: A205922 A256766 A210140 * A250149 A243969 A231424

Adjacent sequences:  A232756 A232757 A232758 * A232760 A232761 A232762

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Nov 29 2013

STATUS

approved

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Last modified January 19 02:30 EST 2022. Contains 350464 sequences. (Running on oeis4.)