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 A203375 #7 Jul 22 2025 17:11:17 %S A203375 972,15564,253068,4136292,67731264,1109832180,18189909480, %T A203375 298154846436,4887277903812,80111933563464,1313194979326320, %U A203375 21525927546323460,352853780193705264,5783993041849734792,94811448308361126864 %N A203375 Number of (n+1)X6 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements. %C A203375 Column 5 of A203378 %H A203375 R. H. Hardin, <a href="/A203375/b203375.txt">Table of n, a(n) for n = 1..210</a> %F A203375 Empirical: a(n) = 30*a(n-1) -291*a(n-2) +1278*a(n-3) -2901*a(n-4) +3519*a(n-5) -2152*a(n-6) +516*a(n-7) %e A203375 Some solutions for n=4 %e A203375 ..0..1..1..0..1..1....0..0..1..1..0..0....0..0..1..0..1..1....1..0..0..1..0..1 %e A203375 ..0..0..1..1..0..1....0..0..0..1..1..0....0..0..0..0..0..1....0..1..0..0..0..0 %e A203375 ..0..1..1..0..0..0....1..0..1..0..1..1....1..0..0..0..0..0....0..0..1..0..1..0 %e A203375 ..0..0..1..1..0..1....1..1..0..0..0..1....1..1..0..0..1..0....1..0..0..1..1..1 %e A203375 ..0..1..1..0..1..0....1..0..0..0..1..0....1..1..1..0..0..1....0..1..0..0..1..1 %K A203375 nonn %O A203375 1,1 %A A203375 _R. H. Hardin_ Dec 31 2011