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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.

A239811 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4.

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%I A239811 #7 Jun 02 2025 09:31:40
%S A239811 2,23,1480,510748,884977259,8243207656791,399696014140196630,
%T A239811 102140919909434198721245,136329092264192919129397551406
%N A239811 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4.
%C A239811 Diagonal of A239819
%e A239811 Some solutions for n=3
%e A239811 ..3..2..2....3..2..0....3..0..0....3..2..2....2..3..3....3..2..0....2..3..3
%e A239811 ..3..0..1....2..1..0....1..0..2....3..2..2....2..1..1....2..0..0....2..3..3
%e A239811 ..2..0..1....3..1..3....2..0..1....1..2..0....2..3..2....1..2..2....3..2..0
%K A239811 nonn
%O A239811 1,1
%A A239811 _R. H. Hardin_, Mar 27 2014

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