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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.

A200794 Number of n X n 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 A200794 #8 Jul 22 2025 15:56:12
%S A200794 1,15,9880,132636590,26207146328784,75743730886453371522,
%T A200794 3202145671418507455058837791
%N A200794 Number of n X n 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 A200794 Diagonal of A200801
%e A200794 Some solutions for n=3
%e A200794 ..0..1..2....0..1..0....0..1..1....0..1..1....0..1..2....0..1..0....0..1..2
%e A200794 ..2..0..0....2..2..1....2..1..3....1..1..2....1..1..3....1..1..2....1..1..2
%e A200794 ..3..3..1....0..0..3....3..0..2....3..2..2....0..0..3....3..2..0....3..2..2
%K A200794 nonn
%O A200794 1,2
%A A200794 _R. H. Hardin_ Nov 22 2011

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