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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.

A218515 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..3 n X n array.

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%I A218515 #7 Jul 22 2025 23:57:19
%S A218515 4,36,4634,1608968,3856183182,40522780697742,2345237392530015812,
%T A218515 681081741849413830473468,1012037226170162671485394009190
%N A218515 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random 0..3 n X n array.
%C A218515 Diagonal of A218522
%e A218515 Some solutions for n=3
%e A218515 ..1..1..2....3..1..1....0..0..0....3..1..2....1..1..3....2..2..3....2..2..2
%e A218515 ..2..0..0....3..0..0....3..0..3....1..0..0....2..1..1....2..1..2....3..1..3
%e A218515 ..2..0..2....3..0..1....2..1..1....1..0..0....1..1..1....1..1..2....1..1..2
%K A218515 nonn
%O A218515 1,1
%A A218515 _R. H. Hardin_ Oct 31 2012

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