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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.

A204704 Number of nX7 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order.

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%I A204704 #7 Jul 22 2025 18:14:55
%S A204704 224,301056,91733605,38585324821,15521787839696,6319625580942184,
%T A204704 2568926644225402978,1044792211767082026764,424880469013125627760792,
%U A204704 172792044105478879279518350,70270849522277745874734015748
%N A204704 Number of nX7 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order.
%C A204704 Column 7 of A204705
%e A204704 Some solutions for n=5
%e A204704 ..0..0..1..1..2..2..0....0..1..0..2..1..2..2....0..0..1..0..2..2..1
%e A204704 ..2..2..0..1..2..2..0....1..1..0..1..1..0..0....2..0..0..2..0..0..2
%e A204704 ..1..0..0..2..0..1..1....2..0..1..2..0..0..1....2..2..1..1..0..2..2
%e A204704 ..1..0..1..2..2..0..0....1..2..0..2..2..1..0....0..1..0..1..2..0..0
%e A204704 ..0..1..0..0..1..1..2....0..1..0..1..1..0..1....1..0..2..0..2..0..1
%K A204704 nonn
%O A204704 1,1
%A A204704 _R. H. Hardin_ Jan 18 2012

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