1,2
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polycairo
Sequence in context: A000458 A089928 A036887 this_sequence A026269 A000645 A005958
Adjacent sequences: A151533 A151534 A151535 this_sequence A151537 A151538 A151539
nonn
Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
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