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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.

A206884 Number of n X n 0..1 arrays avoiding 0 1 0 horizontally and 1 0 0 vertically.

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%I A206884 #8 Jul 22 2025 19:46:30
%S A206884 2,16,240,7878,607043,111550389,47015346159,45805591252624,
%T A206884 104403459975101887,559553426119779395361,7050914050087672286282505,
%U A206884 208939006267581096192535752843,14569335412372326231761169576376298
%N A206884 Number of n X n 0..1 arrays avoiding 0 1 0 horizontally and 1 0 0 vertically.
%C A206884 Diagonal of A206889
%e A206884 Some solutions for n=4
%e A206884 ..0..0..1..1....1..0..1..1....0..0..1..1....0..1..1..1....1..0..0..0
%e A206884 ..1..0..0..0....1..1..1..1....0..0..1..1....0..0..1..1....0..1..1..0
%e A206884 ..0..1..1..1....0..1..1..1....1..1..0..0....1..1..1..0....1..0..1..1
%e A206884 ..1..0..1..1....1..1..0..0....1..1..1..1....0..1..1..1....1..1..1..1
%K A206884 nonn
%O A206884 1,1
%A A206884 _R. H. Hardin_ Feb 13 2012

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