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A185823 1/5 the number of n X 7 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors. 0

%I #8 Jun 17 2022 14:55:22

%S 65,426928,956312244,2852526229300,7662203273902712

%N 1/5 the number of n X 7 0..4 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

%C Column 7 of A185825.

%e Some solutions for 4 X 7 with a(1,1)=0

%e ..0..0..0..3..3..1..2....0..0..0..2..2..2..0....0..0..0..1..4..4..0

%e ..0..1..0..1..2..1..2....0..1..0..1..1..0..0....0..1..0..1..3..3..0

%e ..0..1..0..1..2..1..2....0..1..0..1..0..1..1....0..1..0..1..0..4..4

%e ..0..0..0..1..0..0..2....0..0..0..1..0..0..0....0..0..0..1..0..3..3

%Y Cf. A185825.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 05 2011

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Last modified July 19 10:32 EDT 2024. Contains 374392 sequences. (Running on oeis4.)