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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.

A217542 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random 0..2 n X n array.

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%I A217542 #7 Jul 22 2025 23:40:26
%S A217542 3,3,81,1401,128051,22263471,12094757481,16101863824781
%N A217542 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random 0..2 n X n array.
%C A217542 Diagonal of A217547
%e A217542 Some solutions for n=3
%e A217542 ..2..2..2....2..2..2....1..1..2....1..1..2....1..0..0....2..1..1....1..0..0
%e A217542 ..0..0..2....1..0..0....1..1..2....1..0..0....0..0..0....1..1..1....1..0..0
%e A217542 ..0..0..2....1..0..0....1..1..2....1..0..0....0..0..0....1..1..1....1..0..0
%K A217542 nonn
%O A217542 1,1
%A A217542 _R. H. Hardin_ Oct 06 2012

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