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A151521 Number of 2-sided strip polytans with n cells. 1

%I #8 Jan 07 2022 13:03:49

%S 1,3,4,13,25,72,166,450,1124,2973,7603,19865,51199,132982,343290,

%T 888309,2292325,5918742,15258937,39329418

%N Number of 2-sided strip polytans 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/Polytan.html">Polytan</a>

%Y Cf. A006074, A151520.

%K nonn,hard,more

%O 1,2

%A _Ed Pegg Jr_, May 13 2009

%E a(6)-a(20) from _John Mason_, Jan 07 2022

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)