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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.

A207311 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.

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%I A207311 #8 Jul 22 2025 20:17:21
%S A207311 3,81,15390,21162579,205235353935,14121763303437256,
%T A207311 6886304943923084187412,23820527297958550757568717516,
%U A207311 584573521981314585923770355820671056
%N A207311 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal.
%C A207311 Diagonal of A207317
%e A207311 Some solutions for n=4
%e A207311 ..1..0..2..0....0..2..0..2....1..1..1..0....0..2..2..0....2..2..1..2
%e A207311 ..1..0..0..0....2..2..0..2....1..2..1..2....1..0..0..0....2..1..0..0
%e A207311 ..2..1..0..0....2..0..1..0....0..1..0..1....0..2..1..2....1..1..1..0
%e A207311 ..2..0..0..0....0..2..1..0....2..0..0..1....0..0..0..0....2..1..0..2
%K A207311 nonn
%O A207311 1,1
%A A207311 _R. H. Hardin_ Feb 16 2012

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