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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.

A240197 Number of 7Xn 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 or three plus the sum of the elements diagonally to its northwest, modulo 4.

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%I A240197 #5 Jun 02 2025 09:42:22
%S A240197 15,358,10017,333607,14022582,733907809,43398047802,2752449791995,
%T A240197 182092505409165,12353055792220215,850428778272052568,
%U A240197 59048111282882480477,4120092662704003963630
%N A240197 Number of 7Xn 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 or three plus the sum of the elements diagonally to its northwest, modulo 4.
%C A240197 Row 7 of A240192
%e A240197 Some solutions for n=3
%e A240197 ..2..0..0....2..0..0....2..0..0....2..0..0....2..0..0....2..0..0....2..0..0
%e A240197 ..1..0..2....1..0..2....1..2..0....1..0..0....2..0..0....2..0..0....1..0..0
%e A240197 ..1..2..2....2..3..0....2..1..0....1..3..2....2..3..2....2..0..0....2..3..2
%e A240197 ..2..1..0....1..2..2....1..3..3....2..3..2....1..2..1....1..3..2....1..2..0
%e A240197 ..1..3..2....1..3..2....1..2..1....1..0..0....2..1..1....1..2..2....1..3..2
%e A240197 ..1..2..1....1..2..2....1..3..3....2..1..0....1..2..0....2..1..0....1..3..2
%e A240197 ..2..3..3....2..1..0....2..3..2....1..2..0....1..2..2....2..0..3....2..1..2
%K A240197 nonn
%O A240197 1,1
%A A240197 _R. H. Hardin_, Apr 02 2014

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