A264575 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.

4, 64, 646, 18540, 403872, 13182464, 298587595, 8004883334, 207395987160, 5415371441696, 139437679992950, 3610605830997732, 93761760429319800, 2424276830794155853, 62680901817510938800, 1621243139189452222421

Offset: 1

Author

R. H. Hardin, Nov 17 2015

Keywords

• nonn

Comments

Row 7 of A264569.

Examples

			Some solutions for n=4
..1..2..6..4..8....1..2..3..4..8....1..2..6..4..8....1..5..6..4..8
..0..7.11.12..3....0.10.11..9.13....0..7.11..9..3....0.10..2..3.13
..5.15.13.14..9....5..6..7.14.18....5.15.16.14.18...11.15..7.14..9
.16.10.18.19.23...16.20.21.12.23...10.17.12.19.13...16.17.18.12.23
.21.25.17.24.28...15.22.17.24.19...21.22.23.27.28...21.25.26.24.19
.20.27.22.29.33...26.30.28.32.33...26.20.31.29.24...20.27.22.32.33
.31.35.26.37.38...25.35.27.37.29...25.35.36.34.38...31.35.36.28.29
.36.30.32.39.34...36.31.38.39.34...30.37.32.39.33...30.37.38.39.34
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..79

Crossrefs

Cf. A264569.