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Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.
0

%I #5 Nov 14 2015 16:51:44

%S 1,42,972,23076,2186741,42169152,2775259622,98973991195,4820591214512

%N Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

%C Column 6 of A264490.

%e Some solutions for n=4

%e ..7..8..9.10.11..6.13....7..8..9.10.20.12.13....7..8..3.10.11..6.13

%e ..0..1..2..3..4.19.20....0.15.25..3..4.19..6...14.15.16.17.18..5.20

%e .21.22.23.24.34.26..5...30.22..1..2.11.26..5...21..0..1..2.34..4.27

%e .28.15.30.17.32.33.12...28.29.16.31.32.33.34...28..9.30.31.32.33.12

%e .29.14.31.16.25.18.27...21.14.23.24.17.18.27...29.22.23.24.25.26.19

%Y Cf. A264490.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 14 2015