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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.

A239994 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

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%I A239994 #9 Sep 05 2025 13:51:12
%S A239994 2,13,190,6527,635873,191691132,182333502325
%N A239994 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
%C A239994 Diagonal of A240000.
%e A239994 Some solutions for n=4
%e A239994 ..3..3..0..0....0..3..3..0....0..3..3..0....3..3..0..0....3..3..0..0
%e A239994 ..0..3..3..0....3..2..3..3....0..0..3..1....0..3..1..3....0..2..1..3
%e A239994 ..3..2..0..1....0..2..2..0....0..0..2..0....0..3..2..0....0..2..1..2
%e A239994 ..3..1..0..2....2..2..0..0....3..3..0..0....0..0..2..2....0..2..2..0
%Y A239994 Cf. A240000.
%K A239994 nonn,changed
%O A239994 1,1
%A A239994 _R. H. Hardin_, Mar 30 2014

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