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 A203832 #7 Jul 22 2025 17:32:41 %S A203832 28125,1330353,66490965,3383285769,173185290765,8882824128417, %T A203832 455911325162757,23404859123410809,1201610596654827837, %U A203832 61692467471143085457,3167408545022070490293,162621217966800381937641 %N A203832 Number of (n+1)X6 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements. %C A203832 Column 5 of A203835 %H A203832 R. H. Hardin, <a href="/A203832/b203832.txt">Table of n, a(n) for n = 1..210</a> %F A203832 Empirical: a(n) = 77*a(n-1) -1444*a(n-2) +5860*a(n-3) +38744*a(n-4) -300016*a(n-5) +339296*a(n-6) +1286720*a(n-7) -2655360*a(n-8) -56832*a(n-9) +1682944*a(n-10) -149504*a(n-11) -163840*a(n-12) %e A203832 Some solutions for n=4 %e A203832 ..2..0..1..0..0..0....1..2..2..2..0..1....2..0..1..2..0..2....2..1..0..2..1..2 %e A203832 ..2..2..0..2..0..0....0..1..2..1..2..0....1..2..0..1..2..1....2..2..1..0..2..1 %e A203832 ..2..0..0..0..2..0....2..0..1..0..1..2....2..2..2..0..1..2....0..2..2..1..0..2 %e A203832 ..1..2..0..2..2..2....2..2..0..0..0..1....2..2..0..0..0..1....0..0..2..2..1..0 %e A203832 ..1..1..2..2..0..2....0..2..2..0..0..0....2..0..1..0..0..0....1..0..0..2..2..1 %K A203832 nonn %O A203832 1,1 %A A203832 _R. H. Hardin_ Jan 06 2012