A264556 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

0, 93, 1204, 23140, 813473, 25172836, 591482528, 15554895920, 426023121887, 11212094301173, 288664400022091, 7526121840247476, 196724860860294913, 5099876575111214715, 131971387912281226253, 3420386371154190796380

Offset: 1

Author

R. H. Hardin, Nov 17 2015

Keywords

• nonn

Comments

Row 7 of A264550.

Examples

			Some solutions for n=4
..1..2..3..4..7....1..2..5..6..8....1..2..3..4..8....1..2..6..4..8
..0.10..8.11.13....0..7.10..3..4....0..7.11.12.13....0..7.10..3.12
..5..6.15.14..9...11.12.15.17..9....5..6.15.16..9....5.15.13.14..9
.16.20.12.22.23...16.20.18.13.14...10.17.20.19.14...16.11.20.19.23
.21.25.17.18.19...21.22.23.24.19...21.22.23.18.28...21.22.17.18.27
.26.27.30.32.24...26.27.30.31.33...26.27.30.32.24...26.30.28.29.24
.31.35.33.28.29...25.32.35.28.29...25.35.33.37.29...25.35.33.37.38
.36.37.38.39.34...36.37.38.39.34...36.31.38.39.34...36.31.32.39.34
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..73

Crossrefs

Cf. A264550.