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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.

A196011 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors within one of itself.

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%I A196011 #8 Jul 22 2025 12:49:51
%S A196011 1,1,2,25,106,708,22711,670449,44864449,5122273171,1106078073333,
%T A196011 426788297174150
%N A196011 Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors within one of itself.
%C A196011 Diagonal of A196017
%e A196011 Some solutions for n=4
%e A196011 ..2..3..2..2....2..3..2..0....0..2..3..2....0..2..2..2....2..2..3..2
%e A196011 ..3..3..0..2....3..4..3..2....2..3..4..3....2..3..0..2....2..0..3..3
%e A196011 ..3..4..3..2....2..3..0..2....2..0..3..2....3..4..3..2....2..3..4..3
%e A196011 ..2..3..2..0....0..2..2..2....2..2..2..0....2..3..2..0....0..2..3..2
%K A196011 nonn
%O A196011 1,3
%A A196011 _R. H. Hardin_ Sep 26 2011

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