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.

A201802 Number of zero-sum nX7 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.

This page as a plain text file.
%I A201802 #6 Jul 22 2025 16:21:08
%S A201802 8135,1972115,90062519,10857153407,1077779765471
%N A201802 Number of zero-sum nX7 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors.
%C A201802 Column 7 of A201803
%e A201802 Some solutions for n=2
%e A201802 .-2.-2.-2..1..1..2..0...-2.-2..2..2.-1.-1.-1...-2.-2.-1.-1.-1..2..0
%e A201802 ..1..1.-2.-2..1..2..1....1.-2..2..1..1..0..0....1..1..0..0..2..2.-1
%K A201802 nonn
%O A201802 1,1
%A A201802 _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.