%I #14 Jan 15 2024 22:39:23
%S 2,11,163,6547,720417,216173426,177509416175,398239490006383,
%T 2441922679051541299,40923800121824894177005,
%U 1874434223405139511637099884,234647514833189124245764389957097,80281172893810827268371440460572492150
%N Number of binary arrangements on n X n array without adjacent three 1's.
%D Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 342-349.
%H Steven R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/constant/square/square.html">Hard Square Entropy Constant</a> [Broken link]
%H Steven R. Finch, <a href="http://web.archive.org/web/20010605012506/http://www.mathsoft.com/asolve/constant/square/square.html">Hard Square Entropy Constant</a> [From the Wayback machine]
%Y Adjacent three in a row or column gives A050974.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 02 2002
%E a(13) from _Sean A. Irvine_, Jan 15 2024
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