cp's OEIS Frontend

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.

A187626 Number of 4X4 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.

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%I A187626 #6 Jul 22 2025 10:50:35
%S A187626 2,60,390,2146,5324,16042,28916,71012,121678,216768,302470,606282,
%T A187626 785548
%N A187626 Number of 4X4 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation.
%C A187626 Row 3 of A187624
%e A187626 Some n=3 solutions for 4X4
%e A187626 ..1..3..0..3....1..0..2..1....3..2..0..2....3..1..0..3....2..2..0..2
%e A187626 ..0..3..1..3....3..1..1..0....2..2..1..2....0..3..3..1....0..2..2..3
%e A187626 ..1..3..1..0....1..1..1..2....3..2..1..0....1..3..3..0....2..2..2..1
%e A187626 ..2..3..2..3....3..2..0..1....1..0..1..2....3..0..1..3....2..0..2..3
%K A187626 nonn
%O A187626 1,1
%A A187626 _R. H. Hardin_ Mar 12 2011

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