1,2
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polycairo
Sequence in context: A029855 A110014 A026581 this_sequence A001372 A049117 A146810
Adjacent sequences: A151532 A151533 A151534 this_sequence A151536 A151537 A151538
nonn
Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
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