1,2
Ed Pegg, Jr., Illustrations of polyforms
Eric Weisstein's World of Mathematics, Polykite
Sequence in context: A177795 A092685 A172481 * A192922 A017919 A017920
Adjacent sequences: A151526 A151527 A151528 * A151530 A151531 A151532
nonn
Ed Pegg, Jr., (ed(AT)mathpuzzle.com), May 13 2009
a(15)-a(22) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 28 2010