1,3
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polyhex
Sequence in context: A065178 A148438 A148439 this_sequence A052870 A001444 A138574
Adjacent sequences: A151512 A151513 A151514 this_sequence A151516 A151517 A151518
nonn
Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
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