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 A232310 #11 Jul 23 2025 07:17:31 %S A232310 2,24,1202,231454,161243887,400571676322,3587649343841650, %T A232310 115662789623304964655,13420410026776778616974635, %U A232310 5604396268950285334109397116334,8423557107575828118320152665611119144 %N A232310 Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal or antidiagonal neighbor, with top left element zero. %C A232310 Diagonal of A232316 %H A232310 R. H. Hardin, <a href="/A232310/b232310.txt">Table of n, a(n) for n = 1..15</a> %e A232310 Some.solutions.for.n=3 %e A232310 ..0..0..1..1....0..0..1..0....0..0..1..1....0..0..0..1....0..0..0..1 %e A232310 ..0..1..1..1....1..1..0..1....0..1..1..0....0..0..1..0....0..0..1..1 %e A232310 ..1..0..1..1....0..0..1..1....1..0..0..1....0..1..0..1....0..1..1..1 %e A232310 ..0..0..0..0....1..1..0..0....1..1..1..1....0..0..1..1....1..1..1..1 %K A232310 nonn %O A232310 1,1 %A A232310 _R. H. Hardin_, Nov 22 2013