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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.

A218647 Number of nX4 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..3 nX4 array.

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%I A218647 #6 Jul 23 2025 00:02:27
%S A218647 36,292,4946,82188,1374954,23370578,394655980,6688451956,113330380248,
%T A218647 1919929942392,32533805101006,551254991578840,9340671432312772,
%U A218647 158272966584027210,2681844781855552786,45442423044091925218
%N A218647 Number of nX4 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..3 nX4 array.
%C A218647 Column 4 of A218651
%H A218647 R. H. Hardin, <a href="/A218647/b218647.txt">Table of n, a(n) for n = 1..210</a>
%e A218647 Some solutions for n=3
%e A218647 ..2..2..2..1....2..1..1..1....0..0..0..0....2..1..1..1....0..0..1..2
%e A218647 ..2..2..1..1....2..1..1..1....0..0..0..0....2..1..1..1....0..0..2..2
%e A218647 ..2..2..1..1....2..1..1..2....2..3..2..2....3..3..1..1....0..0..3..3
%K A218647 nonn
%O A218647 1,1
%A A218647 _R. H. Hardin_ Nov 03 2012

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