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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.

A189347 Number of n X n array permutations with each element moving one space diagonally, horizontally or vertically.

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%I A189347 #15 Aug 28 2024 09:26:04
%S A189347 0,4,48,12592,10252800,64731638400,2239546267804672,
%T A189347 494966160398383884544,658664151315274081588459520,
%U A189347 5410532537689878793764236394523648,271891121107496085701096037929377481809920
%N A189347 Number of n X n array permutations with each element moving one space diagonally, horizontally or vertically.
%e A189347 Some solutions for 3 X 3:
%e A189347 ..1..2..5....4..0..1....1..2..5....4..2..1....3..2..1....3..0..5....1..0..5
%e A189347 ..0..8..4....6..3..2....7..0..8....0..5..8....4..0..8....6..1..2....6..8..2
%e A189347 ..3..6..7....7..8..5....3..6..4....3..6..7....7..6..5....7..8..4....3..4..7
%Y A189347 Diagonal of A189355.
%K A189347 nonn,more
%O A189347 1,2
%A A189347 _R. H. Hardin_, Apr 20 2011
%E A189347 a(9)-a(11) from _Pontus von Brömssen_, Aug 28 2024

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