%I A006074 M2379
%S A006074 1,3,4,14,30,107,318,1116,3743,13240,46476,166358
%N A006074 Number of polyaboloes (or polytans): number of different shapes that 
               can be formed with n half-squares.
%C A006074 Also called supertangrams: a generalization of tangrams.
%D A006074 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006074 M. Gardner, Mathematical Magic Show. Random House, NY, 1978, p. 151 (but 
               beware errors).
%D A006074 T. H. O'Beirne, New Scientist, 266 (Dec. 21, 1961), p. 752.
%H A006074 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/
               ">Illustrations of polyforms</a>
%H A006074 A. Clarke, <a href="http://www.geocities.com/alclarke0/PolyPages/Polyaboloes.htm">
               Polyaboloe page</a>
%H A006074 A. Clarke, <a href="a6074.gif">Illustration of initial terms</a>
%H A006074 M. Keller, <a href="http://www.solitairelaboratory.com/polyenum.html">
               Counting Polyforms</a>
%H A006074 H. Picciotto, <a href="http://www.picciotto.org/math-ed/puzzles/#supertangrams">
               Geometric Puzzles</a>
%H A006074 M. Vicher, <a href="http://www.vicher.cz/puzzle/polyforms.htm">Polyforms</
               a>
%H A006074 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Polyabolo.html">Polyabolo.</a>
%H A006074 Author? <a href="http://translate.google.com/translate?hl=en&sl=ja&u=http:/
               /www32.ocn.ne.jp/~graph_puzzle/1no34.htm&sa=X&oi=translate&resnum=4&ct=result&prev=/
               search%3Fq%3D318%2B1116%2B3743%2B13240%2B46476%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:o\
               fficial%26hs%3Dmar">Polyaboloes</a>.
%Y A006074 Sequence in context: A080878 A110565 A057433 this_sequence A081714 A117718 
               A086826
%Y A006074 Adjacent sequences: A006071 A006072 A006073 this_sequence A006075 A006076 
               A006077
%K A006074 nonn,nice,hard
%O A006074 1,2
%A A006074 N. J. A. Sloane (njas(AT)research.att.com).
%E A006074 Corrected values for a(8) and a(9), found by Aaron Siegel and confirmed 
               by a Japanese puzzlist named Taro, reported by Michael Keller (Wgreview(AT)aol.com), 
               Sep 02 2000
%E A006074 One more term from Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 11 2007