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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.

A208870 Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.

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%I A208870 #7 Jul 22 2025 21:32:41
%S A208870 187,334618,683903931,1404920207834,2887736845657700,
%T A208870 5935974611645510227,12201956787655438957014,
%U A208870 25082292111547260024518313,51559059416667161930347967813,105984596999356698511898369562313
%N A208870 Number of nX6 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.
%C A208870 Column 6 of A208872
%H A208870 R. H. Hardin, <a href="/A208870/b208870.txt">Table of n, a(n) for n = 1..210</a>
%e A208870 Some solutions for n=4
%e A208870 ..0..0..0..0..0..1....0..0..0..0..0..0....0..0..0..1..2..3....0..0..0..0..0..1
%e A208870 ..1..1..1..1..0..1....1..1..2..1..1..1....2..1..2..3..1..1....1..1..2..1..3..2
%e A208870 ..0..0..0..2..3..1....0..1..2..0..3..2....1..0..2..1..3..3....2..3..0..3..1..0
%e A208870 ..1..2..0..1..0..0....1..2..3..0..0..3....1..2..0..2..2..1....2..1..0..3..3..3
%K A208870 nonn
%O A208870 1,1
%A A208870 _R. H. Hardin_ Mar 02 2012

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