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%I #7 Nov 10 2015 10:40:36
%S 1,4,64,1728,104976,21870000,12656250000,16588800000000,
%T 55662776156160000,524753103350661120000,13063269877417673072640000,
%U 823784380246050405868707840000,135558605263753575626189314498560000
%N Number of (n+1)X(n+1) arrays of permutations of 0..(n+1)^2-1 with each element having index change +-(.,.) 0,0 or 1,2.
%C Diagonal of A263989.
%H R. H. Hardin, <a href="/A263988/b263988.txt">Table of n, a(n) for n = 1..15</a>
%e Some solutions for n=4
%e ..7..1..9..3..4....0..8..2..3..4....0..1..2..3..4....0..1..9..3..4
%e ..5.13..0..8..2....5..6..7..1..9....5.13..7..8..9...12.13..7..8..2
%e .17.11.12..6.14...10.11.12.13.14...10.11.19..6.14...10.11..5..6.14
%e .15.23.10.18.19...22.23.17.18.19...22.16.24.18.12...22.16.17.18.19
%e .20.21.22.16.24...20.21.15.16.24...20.21.15.23.17...20.21.15.23.24
%Y Cf. A263989.
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 31 2015
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