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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.

A240006 Number of 7Xn 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 A240006 #5 Jun 02 2025 09:37:53
%S A240006 368,22592,685898,18392485,429788876,9314138750,182333502325,
%T A240006 3306340714115,55641031584148,875242526758630
%N A240006 Number of 7Xn 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 A240006 Row 7 of A240000
%e A240006 Some solutions for n=3
%e A240006 ..0..0..0....0..0..0....0..0..0....0..0..3....0..0..0....0..0..0....0..0..0
%e A240006 ..0..3..3....3..3..0....3..3..0....0..0..0....0..0..0....3..3..0....0..0..3
%e A240006 ..0..3..3....2..2..3....3..3..1....0..0..2....3..3..0....0..2..1....0..3..3
%e A240006 ..0..2..1....0..2..0....3..1..2....0..0..2....2..2..3....2..0..0....3..3..2
%e A240006 ..0..0..2....0..0..3....0..2..0....0..0..0....2..2..0....2..0..2....3..2..3
%e A240006 ..0..0..2....0..3..3....2..2..3....3..3..0....0..2..0....2..1..2....3..1..0
%e A240006 ..0..3..3....0..3..1....0..2..1....0..3..3....2..2..2....0..2..2....0..2..0
%K A240006 nonn
%O A240006 1,1
%A A240006 _R. H. Hardin_, Mar 30 2014

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