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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.

A200800 Number of nX7 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

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%I A200800 #6 Jul 22 2025 15:56:39
%S A200800 715,9676364,122478253815,1557479347400065,19804473216531794553,
%T A200800 251826890612151285556718,3202145671418507455058837791
%N A200800 Number of nX7 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
%C A200800 Column 7 of A200801
%e A200800 Some solutions for n=3
%e A200800 ..0..1..0..0..1..2..2....0..1..0..0..2..1..1....0..1..0..0..1..2..3
%e A200800 ..1..0..0..1..2..0..1....1..0..0..1..2..1..0....1..0..0..1..3..3..3
%e A200800 ..0..0..1..0..0..1..2....0..0..1..0..1..2..3....0..0..1..0..3..1..1
%K A200800 nonn
%O A200800 1,1
%A A200800 _R. H. Hardin_ Nov 22 2011

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