cp's OEIS Frontend

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.

A201800 Number of zero-sum nX5 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.

This page as a plain text file.
%I A201800 #6 Jul 22 2025 16:20:54
%S A201800 381,28625,562961,20960485,722587629,27941324053,1077779765471
%N A201800 Number of zero-sum nX5 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.
%C A201800 Column 5 of A201803
%e A201800 Some solutions for n=2
%e A201800 .-1.-2.-2..0..0....1..1.-2..1..1...-1..1..1..1..1...-2.-1.-1..2.-2
%e A201800 ..2..2..1..1.-1....0..0.-2.-2..2...-2.-2..1..0..0...-1..1..1..2..1
%K A201800 nonn
%O A201800 1,1
%A A201800 _R. H. Hardin_ Dec 05 2011

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.