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 A205252 #7 Jul 22 2025 18:41:46 %S A205252 976,15568,253072,4136296,67731268,1109832184,18189909484, %T A205252 298154846440,4887277903816,80111933563468,1313194979326324, %U A205252 21525927546323464,352853780193705268,5783993041849734796,94811448308361126868 %N A205252 Number of (n+1)X6 0..1 arrays with the number of clockwise edge increases in every 2X2 subblock the same. %C A205252 Column 5 of A205255 %H A205252 R. H. Hardin, <a href="/A205252/b205252.txt">Table of n, a(n) for n = 1..210</a> %F A205252 Empirical: a(n) = 31*a(n-1) -321*a(n-2) +1569*a(n-3) -4179*a(n-4) +6420*a(n-5) -5671*a(n-6) +2668*a(n-7) -516*a(n-8) %e A205252 Some solutions for n=4 %e A205252 ..1..0..0..0..1..0....0..0..0..1..0..0....1..1..0..1..0..1....1..1..1..1..0..1 %e A205252 ..0..0..1..1..1..0....1..0..1..1..1..1....0..1..1..1..0..1....1..0..1..0..0..0 %e A205252 ..1..0..1..0..0..0....1..1..1..0..0..1....0..1..0..1..1..1....0..0..1..0..1..1 %e A205252 ..1..0..1..1..0..1....0..1..0..0..1..1....0..1..1..1..0..1....0..1..1..1..1..0 %e A205252 ..0..0..0..1..0..0....1..1..0..1..1..0....0..1..0..0..0..1....1..1..0..1..0..0 %K A205252 nonn %O A205252 1,1 %A A205252 _R. H. Hardin_ Jan 24 2012