OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..300
S. Butler, J. Ekstrand, S. Osborne, TETRIS Tiling, AMS Spring Central Sectional, Iowa State University, April 27-28 2013
Wikipedia, Tetromino
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 27 2013
STATUS
approved