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%I #6 Apr 20 2020 19:54:29
%S 0,840,12377400,3263186052840,19179756370570398120,
%T 2711366026130939117933480040,9555836762886245973504760743477970440
%N Number of n X n 0..6 arrays with some element plus some horizontally or vertically adjacent neighbor totalling six exactly once.
%C Diagonal of A269902.
%e Some solutions for n=2
%e ..0..6. .6..6. .6..1. .2..0. .0..5. .4..1. .3..3. .1..3. .0..6. .5..5
%e ..3..4. .1..5. .3..5. .6..6. .0..6. .4..5. .1..1. .5..5. .5..4. .1..0
%Y Cf. A269902.
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 07 2016
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