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.
%I A232081 #6 Jul 23 2025 06:52:35 %S A232081 361,26713,1043172,56126173,3154769585,173086988636,9473198719765, %T A232081 519324660859971,28473688639558276,1560985954158627431, %U A232081 85575766658825822095,4691438854378352243156,257194399345647459891285 %N A232081 Number of (5+1)X(n+1) 0..1 arrays with every element equal to some horizontal, diagonal or antidiagonal neighbor, with top left element zero. %C A232081 Row 5 of A232076 %H A232081 R. H. Hardin, <a href="/A232081/b232081.txt">Table of n, a(n) for n = 1..210</a> %e A232081 Some solutions for n=2 %e A232081 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..1....0..1..1 %e A232081 ..0..1..1....0..0..1....1..1..0....0..1..1....1..1..0....0..0..0....1..0..1 %e A232081 ..1..0..0....0..1..1....0..1..0....0..0..0....0..1..1....1..1..1....1..1..1 %e A232081 ..0..0..1....0..0..1....0..0..0....1..0..0....1..0..1....0..0..1....0..1..1 %e A232081 ..1..1..0....0..0..1....0..1..0....0..1..0....0..1..1....0..0..1....1..0..0 %e A232081 ..1..0..0....1..1..1....0..0..1....1..0..1....0..0..1....1..1..1....0..1..1 %K A232081 nonn %O A232081 1,1 %A A232081 _R. H. Hardin_, Nov 17 2013