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Number of n X n 0..7 arrays with some element plus some horizontally or vertically adjacent neighbor totalling seven exactly once.
0

%I #6 Apr 20 2020 19:55:45

%S 0,1344,45440640,38799000374400,1043364062813432764992,

%T 953623090124975369688224358912,

%U 30710864722727618437291310619830386096704

%N Number of n X n 0..7 arrays with some element plus some horizontally or vertically adjacent neighbor totalling seven exactly once.

%C Diagonal of A270118.

%e Some solutions for n=2

%e ..5..2. .0..2. .0..0. .7..3. .5..1. .5..2. .4..5. .2..1. .7..5. .0..6

%e ..5..1. .6..5. .7..5. .4..3. .2..7. .3..1. .0..2. .5..0. .0..3. .7..7

%Y Cf. A270118.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 11 2016