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%I #4 Nov 16 2015 17:13:16
%S 6,8,644,8018,169195,2856816,50099452,868998834,14882827790,
%T 256959272592,4398347029348,75624723708092,1295898634983579,
%U 22241860959497984,381337803827858013,6540985297761847920,112164265361793394334
%N Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.
%C Column 6 of A264520.
%H R. H. Hardin, <a href="/A264518/b264518.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..9..8..0.12..2..3.13....9..8.11.12..2..3..4....9.10..0..1.13.12..4
%e .16..1.18.17..4..5..6....0..1.16.17.20..5..6...16.15..2..3.20..5..6
%e ..7.24.23.10.11.26.27....7.24.14.10.25.26.13....7..8.14.24.11.17.18
%e .14.15.30.33.34.19.20...28.15.32.33.18.19.34...30.31.32.33.23.19.34
%e .21.22.28.29.25.31.32...21.22.23.29.30.31.27...21.22.28.29.25.26.27
%Y Cf. A264520.
%K nonn
%O 1,1
%A _R. H. Hardin_, Nov 16 2015