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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.

A232069 Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, diagonal or antidiagonal neighbor, with top left element zero.

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%I A232069 #6 Jul 23 2025 06:51:34
%S A232069 3,87,6624,2265691,3154769585,16761785898550,346245388962998639,
%T A232069 27933597031900237580649,8787110268003730673863070121,
%U A232069 10774541106851322777417902818902431
%N A232069 Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, diagonal or antidiagonal neighbor, with top left element zero.
%C A232069 Diagonal of A232076
%e A232069 Some solutions for n=3
%e A232069 ..0..0..0..0....0..1..1..1....0..0..0..1....0..0..1..1....0..0..0..0
%e A232069 ..1..1..0..1....1..0..1..1....0..1..1..0....1..1..0..1....0..0..0..0
%e A232069 ..0..0..1..0....0..0..0..0....1..0..1..1....1..1..0..0....1..0..0..0
%e A232069 ..0..0..1..1....1..1..1..1....0..1..1..1....0..0..1..0....1..1..1..0
%K A232069 nonn
%O A232069 1,1
%A A232069 _R. H. Hardin_, Nov 17 2013

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