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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.

A187634 Number of 4X4 0..n 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 A187634 #6 Jul 22 2025 10:51:26
%S A187634 24,1648,14044,106892,306320,1848504,3549080,9810932,19774644,
%T A187634 44235868,65964188,188874084,261388436,423186604,755637740,1198594384,
%U A187634 1533264084,2755012728,3428332204,5907685880,8225807516
%N A187634 Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular.
%C A187634 Row 3 of A187633
%e A187634 Some n=3 solutions for 4X4
%e A187634 ..2..3..3..3....1..0..0..1....3..3..3..1....0..1..1..1....0..1..2..3
%e A187634 ..2..0..0..2....2..1..1..0....2..0..0..2....2..0..0..2....2..0..0..1
%e A187634 ..3..0..0..2....2..1..1..0....2..0..0..2....1..0..0..2....1..0..0..2
%e A187634 ..3..2..3..1....3..1..1..1....1..3..3..1....1..2..1..0....3..2..1..2
%K A187634 nonn
%O A187634 1,1
%A A187634 _R. H. Hardin_ Mar 12 2011

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