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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A215958 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an nX7 array with new integer colors introduced in row major order.

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%I A215958 #5 Jul 22 2025 23:28:36
%S A215958 5,136,35167,5219070,10289785215,4761748786964
%N A215958 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an nX7 array with new integer colors introduced in row major order.
%C A215958 Column 7 of A215959
%e A215958 Some solutions for n=4
%e A215958 ..0..x..1..x..2..x..3....0..x..1..x..2..x..3....0..x..1..x..2..x..3
%e A215958 ..x..1..x..3..x..1..x....x..1..x..4..x..0..x....x..1..x..4..x..5..x
%e A215958 ..1..x..3..x..1..x..4....1..x..3..x..5..x..6....1..x..3..x..0..x..1
%e A215958 ..x..4..x..2..x..4..x....x..2..x..7..x..2..x....x..3..x..0..x..2..x
%K A215958 nonn
%O A215958 1,1
%A A215958 _R. H. Hardin_ Aug 28 2012

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