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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.

A201957 Number of zero-sum nX4 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.

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%I A201957 #6 Jul 22 2025 16:24:47
%S A201957 231,17903,303955,9654533,300895245,10356370455,360008261031
%N A201957 Number of zero-sum nX4 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.
%C A201957 Column 4 of A201958
%e A201957 Some solutions for n=2
%e A201957 .-1.-2.-2..3....2..1.-3.-3...-3.-3..2..2...-3..0..0..0....3..0.-2.-1
%e A201957 .-2.-2..3..3....3..1..1.-2....1.-3..2..2....0..3..3.-3...-1..0.-2..3
%K A201957 nonn
%O A201957 1,1
%A A201957 _R. H. Hardin_ Dec 06 2011

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