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

%I #9 Jan 07 2022 11:09:59

%S 1,4,6,21,47,134,323,876,2224,5885,15146,39574,102250,265574,686208,

%T 1775646,4583718,11835037,30515520,78652647

%N Number of 1-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, A151521.

%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