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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.

A203372 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

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%I A203372 #8 Jul 22 2025 17:11:10
%S A203372 12,164,5208,387324,67731264,27913330472,27149753088792,
%T A203372 62383316832685348,338853014329060508760,4353185098169744392741448,
%U A203372 132316928041105714306034574480,9518293354852895518368238072987352
%N A203372 Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.
%C A203372 Diagonal of A203378
%H A203372 R. H. Hardin, <a href="/A203372/b203372.txt">Table of n, a(n) for n = 1..14</a>
%e A203372 Some solutions for n=4
%e A203372 ..1..0..0..0..0....1..1..1..1..0....0..0..1..1..0....1..0..0..0..0
%e A203372 ..1..1..0..1..0....1..1..1..1..1....0..0..0..1..1....1..1..0..0..0
%e A203372 ..1..1..1..1..1....1..1..1..0..1....0..1..0..0..1....0..1..1..0..0
%e A203372 ..1..1..1..0..1....0..1..1..1..0....0..0..0..1..0....1..0..1..1..0
%e A203372 ..0..1..1..1..0....0..0..1..0..0....1..0..0..0..0....1..1..1..1..1
%K A203372 nonn
%O A203372 1,1
%A A203372 _R. H. Hardin_ Dec 31 2011

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