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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.

A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.

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%I A187629 #7 Jul 22 2025 10:50:48
%S A187629 10,24,24,954,954,194008,194008,196196792,196196792,1031851558448,
%T A187629 1031851558448,27419179198175312,27419179198175312
%N A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.
%C A187629 Column 1 of A187633
%e A187629 Some solutions for 4X4
%e A187629 ..0..1..1..0....1..0..0..1....1..0..0..1....0..1..1..1....1..1..1..0
%e A187629 ..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1
%e A187629 ..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1
%e A187629 ..1..1..1..1....1..0..0..1....1..0..0..1....1..1..1..1....0..1..1..0
%K A187629 nonn
%O A187629 1,1
%A A187629 _R. H. Hardin_ Mar 12 2011

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