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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.

A199646 Number of nX7 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.

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%I A199646 #6 Jul 22 2025 13:21:21
%S A199646 11,6628,1396083,342328663,80053957248,19161971644783,
%T A199646 4539946639286136,1079929763429897946,256503858825070983388
%N A199646 Number of nX7 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors.
%C A199646 Column 7 of A199647
%e A199646 Some solutions for n=3
%e A199646 ..0..0..1..2..2..0..2....0..1..1..2..0..1..1....0..0..1..1..0..0..0
%e A199646 ..0..0..1..2..2..0..2....0..0..0..2..0..2..2....0..0..2..2..0..2..0
%e A199646 ..1..1..0..0..0..1..1....1..1..1..1..1..1..2....1..1..1..1..1..2..0
%K A199646 nonn
%O A199646 1,1
%A A199646 _R. H. Hardin_ Nov 08 2011

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