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A232698
Number of tilings of an 8 X n rectangle with 2n tetrominoes of any shape.
5
1, 1, 25, 997, 40899, 800290, 22483347, 657253434, 19077209438, 517312744806, 14571957312254, 412240433359025, 11632857444709188, 326275845576101452, 9187549952207915190, 258821654387452112268, 7288072624408347082481, 205113474464891986564786
OFFSET
0,3
LINKS
S. Butler, J. Ekstrand, S. Osborne, TETRIS Tiling, AMS Spring Central Sectional, Iowa State University, April 27-28 2013
Wikipedia, Tetromino
CROSSREFS
Column k=8 of A230031.
Sequence in context: A218230 A219060 A218316 * A139163 A367974 A167257
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 27 2013
STATUS
approved