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.

A229931 Number of nX5 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).

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%I A229931 #6 Jun 02 2025 08:40:00
%S A229931 15,4679,575757,78416265,10521395805,1411363459757,189537122520529,
%T A229931 25452175156264451,3417529000078202173,458884977133199962799,
%U A229931 61616812650798586337473,8273590477515811155826013
%N A229931 Number of nX5 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value 2-x(i,j).
%C A229931 Column 5 of A229934
%H A229931 R. H. Hardin, <a href="/A229931/b229931.txt">Table of n, a(n) for n = 1..210</a>
%e A229931 Some solutions for n=3
%e A229931 ..0..1..1..2..2....0..2..1..1..2....0..2..2..0..2....0..0..2..2..0
%e A229931 ..2..2..0..1..0....0..1..0..0..2....0..0..1..2..1....2..0..2..2..0
%e A229931 ..2..0..1..2..2....1..1..2..0..0....2..2..1..1..1....0..1..1..0..2
%K A229931 nonn
%O A229931 1,1
%A A229931 _R. H. Hardin_, Oct 04 2013