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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.

A189443 Number of n X n array permutations with each element moving zero or one space horizontally or diagonally.

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%I A189443 #8 Jul 22 2025 11:45:22
%S A189443 1,5,80,7300,2735828,4982424404,40668908306516,1544933702911323688,
%T A189443 268632319882770483171376,215429706055786434110682479345,
%U A189443 794334848116480290212387125594468856
%N A189443 Number of n X n array permutations with each element moving zero or one space horizontally or diagonally.
%C A189443 Diagonal of A189449
%e A189443 Some solutions for 3X3
%e A189443 ..4..1..2....0..1..2....0..5..2....0..2..1....1..5..2....0..1..2....1..0..2
%e A189443 ..3..0..5....3..5..4....3..4..1....3..4..5....3..0..4....3..4..5....3..4..5
%e A189443 ..6..7..8....6..8..7....6..8..7....6..8..7....7..6..8....6..8..7....6..8..7
%K A189443 nonn
%O A189443 1,2
%A A189443 _R. H. Hardin_ Apr 22 2011

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