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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.

A239149 Number of (n+1)X(n+1) 0..3 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..3 introduced in row major order.

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%I A239149 #6 Jul 23 2025 10:57:10
%S A239149 1,2,868,135766,821135900,5427557363908,486439997897622259,
%T A239149 105891766683961733641397
%N A239149 Number of (n+1)X(n+1) 0..3 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..3 introduced in row major order.
%C A239149 Diagonal of A239155
%e A239149 Some solutions for n=4
%e A239149 ..0..1..0..2..1....0..1..1..2..3....0..1..2..3..2....0..1..2..0..3
%e A239149 ..0..1..0..2..1....0..1..1..2..3....0..1..2..3..2....0..1..2..0..3
%e A239149 ..3..1..3..2..3....0..2..1..2..3....0..1..3..3..2....0..1..0..1..0
%e A239149 ..3..1..3..2..3....3..2..2..3..2....0..2..3..0..2....0..2..0..1..0
%e A239149 ..3..1..3..2..3....3..2..2..3..2....0..2..3..0..2....0..2..0..1..0
%K A239149 nonn
%O A239149 1,2
%A A239149 _R. H. Hardin_, Mar 11 2014

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