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A151518 Number of 2-sided strip polyiamonds with n cells. 0


%S 1,1,1,2,3,5,8,15,25,46,80,145,256,466,833,1513,2720,4925,8881,16063,

%T 28996,52373,94563,170620,307989,555214,1001774,1804594,3254229,

%U 5858448

%N Number of 2-sided strip polyiamonds with n cells.

%H Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Polyiamond.html">Polyiamond</a>

%K nonn,hard,more

%O 1,4

%A _Ed Pegg Jr_, May 13 2009

%E a(21)-a(30) from _Joseph Myers_, Nov 27 2010

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Last modified August 10 12:18 EDT 2020. Contains 336379 sequences. (Running on oeis4.)