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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.

A201801 Number of zero-sum nX6 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.

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%I A201801 #6 Jul 22 2025 16:21:01
%S A201801 1751,235827,7099021,472565771,27941324053
%N A201801 Number of zero-sum nX6 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.
%C A201801 Column 6 of A201803
%e A201801 Some solutions for n=2
%e A201801 .-1.-1..2..2.-1..2...-1..0.-1..2.-2..1...-2.-2.-2..0..0..2....0.-2..1..1..2..2
%e A201801 .-2.-2..2..2.-1.-2....2..0.-1..2.-2..0....2.-1.-1..1..1..2...-2.-2.-2..1..2.-1
%K A201801 nonn
%O A201801 1,1
%A A201801 _R. H. Hardin_ Dec 05 2011

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