A264481 Number of (7+1)X(n+1) arrays of permutations of 0..n*8+7 with each element having directed index change 0,1 1,0 2,1 or -1,-1.

2, 64, 384, 10116, 174927, 3842048, 74367790, 1462247321, 29509300516, 577847245296, 11385134340072, 225727859320572, 4442739834521648, 87589711996716421, 1729226298092553854, 34086490092213796815

Offset: 1

Author

R. H. Hardin, Nov 14 2015

Keywords

• nonn

Comments

Row 7 of A264476.

Examples

			Some solutions for n=4
..6..0..1..2..3....6..7..8..2..3....6..0..1..9..3....6..7..1..9..3
.11.12.13..7..4....0..1.13.14..4...11.12..2..7..4....0.12..2.14..4
..5.10.18..8..9...16.10.11.19..9....5.10.18..8.13....5.17.11..8.13
.21.15.23.24.14...21..5.12.24.18...21.22.23.24.14...10.22.16.24.18
.26.16.17.29.19...15.20.17.22.23...15.16.17.29.19...15.27.21.29.19
.20.25.22.34.28...31.32.26.27.28...31.32.26.27.28...20.25.26.34.28
.36.37.31.39.33...25.37.38.39.29...25.20.38.39.33...36.37.31.39.23
.30.35.32.27.38...30.35.36.33.34...30.35.36.37.34...30.35.32.33.38
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A264476.