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%I #6 Dec 18 2015 18:17:32
%S 1,5,18,72,2054,53608,1744887,216103851,39184763856,11314547102638,
%T 7873316318240100,9711485486581483616,21262647899259681841579
%N Number of n X n binary arrays with every 1 having exactly two king-move neighbors equal to 1
%C Diagonal of A183450
%e Some solutions for 5X5
%e ..0..0..0..0..0....0..0..0..1..0....0..0..1..0..0....0..1..0..0..0
%e ..1..0..0..0..0....0..1..1..0..1....0..1..0..1..0....1..1..0..1..0
%e ..1..1..0..1..1....1..0..0..0..1....1..0..0..0..1....0..0..0..1..1
%e ..0..0..0..0..1....1..0..0..0..1....1..0..0..0..1....1..1..0..0..0
%e ..0..0..0..0..0....0..1..1..1..0....0..1..1..1..0....0..1..0..0..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 04 2011
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