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 A232080 #7 Jul 23 2025 06:52:28 %S A232080 111,3985,82996,2265691,64298979,1786680190,49535329657,1375366780223, %T A232080 38192786490900,1060470627750905,29445068097883913,817579005907041518, %U A232080 22701109558899272767,630324525317504125167,17501743597007465575440 %N A232080 Number of (4+1)X(n+1) 0..1 arrays with every element equal to some horizontal, diagonal or antidiagonal neighbor, with top left element zero. %C A232080 Row 4 of A232076 %H A232080 R. H. Hardin, <a href="/A232080/b232080.txt">Table of n, a(n) for n = 1..210</a> %H A232080 R. H. Hardin, <a href="/A232080/a232080.txt">Empirical recurrence of order 54</a> %F A232080 Empirical recurrence of order 54 (see link above) %e A232080 Some solutions for n=3 %e A232080 ..0..0..0..0....0..1..1..1....0..0..1..0....0..0..0..0....0..0..1..0 %e A232080 ..1..1..1..1....0..0..1..1....0..1..0..1....1..1..0..1....0..1..0..0 %e A232080 ..1..0..0..1....1..0..1..1....0..0..0..0....1..0..1..0....1..1..1..0 %e A232080 ..1..1..0..0....1..1..1..1....1..0..1..0....1..0..0..0....0..0..1..1 %e A232080 ..0..0..1..1....1..0..0..0....1..1..1..1....1..1..1..0....0..1..0..1 %K A232080 nonn %O A232080 1,1 %A A232080 _R. H. Hardin_, Nov 17 2013