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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.

A187423 Number of (n+1)X6 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.

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%I A187423 #6 Jul 22 2025 10:43:59
%S A187423 15055,319792,5254072,139898890,2868461180,72355701549
%N A187423 Number of (n+1)X6 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.
%C A187423 Column 5 of A187425
%e A187423 Some solutions for 3X6
%e A187423 ..1..0..2..2..0..0....1..0..1..2..0..0....1..1..1..0..1..0....0..2..2..2..0..0
%e A187423 ..2..0..0..1..1..0....1..0..1..1..0..2....0..0..1..1..2..1....0..0..1..2..0..0
%e A187423 ..2..0..2..2..0..0....0..0..1..0..0..2....1..0..2..1..1..1....0..1..1..1..0..1
%K A187423 nonn
%O A187423 1,1
%A A187423 _R. H. Hardin_ Mar 09 2011

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