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%I #4 Nov 17 2015 19:17:20
%S 4,64,646,18540,403872,13182464,298587595,8004883334,207395987160,
%T 5415371441696,139437679992950,3610605830997732,93761760429319800,
%U 2424276830794155853,62680901817510938800,1621243139189452222421
%N Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change 1,0 1,1 0,-1 or -1,1.
%C Row 7 of A264569.
%H R. H. Hardin, <a href="/A264575/b264575.txt">Table of n, a(n) for n = 1..79</a>
%e Some solutions for n=4
%e ..1..2..6..4..8....1..2..3..4..8....1..2..6..4..8....1..5..6..4..8
%e ..0..7.11.12..3....0.10.11..9.13....0..7.11..9..3....0.10..2..3.13
%e ..5.15.13.14..9....5..6..7.14.18....5.15.16.14.18...11.15..7.14..9
%e .16.10.18.19.23...16.20.21.12.23...10.17.12.19.13...16.17.18.12.23
%e .21.25.17.24.28...15.22.17.24.19...21.22.23.27.28...21.25.26.24.19
%e .20.27.22.29.33...26.30.28.32.33...26.20.31.29.24...20.27.22.32.33
%e .31.35.26.37.38...25.35.27.37.29...25.35.36.34.38...31.35.36.28.29
%e .36.30.32.39.34...36.31.38.39.34...30.37.32.39.33...30.37.38.39.34
%Y Cf. A264569.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 17 2015
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