1,3
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polyomino
Sequence in context: A032170 A084081 A106376 this_sequence A001431 A054866 A109616
Adjacent sequences: A151511 A151512 A151513 this_sequence A151515 A151516 A151517
nonn
Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
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