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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.

A187700 Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.

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%I A187700 #6 Jul 22 2025 10:53:07
%S A187700 104,7954,87258,692410,2363474,10839282,23999702,69386216,148926738
%N A187700 Number of 4X4 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
%C A187700 Row 3 of A187699
%e A187700 Some n=3 solutions for 4X4
%e A187700 ..0..2..0..2....0..3..0..3....2..1..2..1....0..1..0..1....0..1..3..2
%e A187700 ..3..1..3..0....1..0..1..3....2..3..2..3....1..3..1..3....2..0..1..0
%e A187700 ..0..2..0..2....0..1..0..1....3..1..3..1....1..2..1..2....0..1..0..2
%e A187700 ..3..2..3..0....3..0..3..2....2..2..2..2....1..1..1..1....2..2..1..2
%K A187700 nonn
%O A187700 1,1
%A A187700 _R. H. Hardin_ Mar 12 2011

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