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A189428 Number of n X n array permutations with each element not moving, or moving one space N, SW or SE.

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%I A189428 #8 Jul 22 2025 11:44:19
%S A189428 1,2,9,140,5680,606201,181540773,150293731826,343426652577376
%N A189428 Number of n X n array permutations with each element not moving, or moving one space N, SW or SE.
%C A189428 Diagonal of A189435
%e A189428 Some solutions for 3X3
%e A189428 ..0..4..2....0..1..2....0..1..2....0..1..2....0..1..5....0..4..5....3..1..2
%e A189428 ..3..7..1....3..4..5....6..7..5....3..7..8....3..2..8....3..2..1....6..0..5
%e A189428 ..6..5..8....6..7..8....4..3..8....6..5..4....6..7..4....6..7..8....4..7..8
%K A189428 nonn
%O A189428 1,2
%A A189428 _R. H. Hardin_ Apr 22 2011

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