%I A006535 M2846
%S A006535 1,1,3,10,33,147,620,2821,12942,60639,286190,1364621,6545430,31586358,
%T A006535 153143956,745700845,3644379397,17869651166,87877879487,433301253231
%N A006535 Number of one-sided hexagonal polyominoes with n cells.
%D A006535 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A006535 J. Meeus, personal communication.
%H A006535 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/
               ">Illustrations of polyforms</a>
%H A006535 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Polyhex.html">Link to a section of The World of Mathematics.</a>
%Y A006535 A006535 = 2*A000228 - A030225.
%Y A006535 Sequence in context: A149030 A149031 A145928 this_sequence A041633 A034215 
               A083580
%Y A006535 Adjacent sequences: A006532 A006533 A006534 this_sequence A006536 A006537 
               A006538
%K A006535 hard,nonn,nice
%O A006535 1,3
%A A006535 N. J. A. Sloane (njas(AT)research.att.com).
%E A006535 More terms from David W. Wilson (davidwwilson(AT)comcast.net). a(13) 
               from Achim Flammenkamp (achim(AT)uni-bielefeld.de) Feb 15 1999.
%E A006535 More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Sep 21 2002