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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.

A189643 Number of n X n array permutations with each element moving zero or one space horizontally, diagonally or antidiagonally.

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%I A189643 #8 Jul 22 2025 11:51:35
%S A189643 1,9,263,107080,250758892,5760755884032,958681588788944613,
%T A189643 1369385680210307625221600
%N A189643 Number of n X n array permutations with each element moving zero or one space horizontally, diagonally or antidiagonally.
%C A189643 Diagonal of A189650
%e A189643 Some solutions for 3X3
%e A189643 ..1..0..2....0..2..1....0..3..2....1..0..2....0..5..4....1..3..2....0..2..1
%e A189643 ..3..8..4....3..8..5....1..6..4....4..3..5....3..2..1....7..0..5....3..4..5
%e A189643 ..6..5..7....6..7..4....7..5..8....7..6..8....6..7..8....6..8..4....7..6..8
%K A189643 nonn
%O A189643 1,2
%A A189643 _R. H. Hardin_ Apr 24 2011

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