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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.

A204977 Number of nX7 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..2 introduced in row major order.

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%I A204977 #7 Jul 22 2025 18:29:13
%S A204977 224,301056,41618941,8202482914,1519010368414,284567725886961
%N A204977 Number of nX7 0..2 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..2 introduced in row major order.
%C A204977 Column 7 of A204978
%e A204977 Some solutions for n=5
%e A204977 ..0..0..1..1..2..0..0....0..0..1..1..2..0..1....0..0..1..0..2..1..1
%e A204977 ..2..1..1..0..1..0..0....1..2..1..2..1..0..1....1..2..1..1..2..1..1
%e A204977 ..2..2..0..1..1..2..1....0..2..0..0..1..2..0....1..0..2..2..0..2..2
%e A204977 ..1..2..0..0..2..2..0....1..0..0..1..2..2..0....2..1..0..0..1..1..0
%e A204977 ..2..0..1..1..2..1..1....1..1..2..0..0..1..2....0..2..2..1..2..2..0
%K A204977 nonn
%O A204977 1,1
%A A204977 _R. H. Hardin_ Jan 21 2012

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