A189456 Number of 8Xn array permutations with each element moving zero or one space horizontally or diagonally.

1, 1597, 250000, 106834338, 33995627281, 12362821462925, 4329976369716644, 1544933702911323688, 548904049287782685569, 195559483332882314913741, 69650888604936997141340729, 24818320628803632672710482237

Offset: 1

Author

R. H. Hardin Apr 22 2011

Keywords

• nonn

Comments

Row 8 of A189449

Examples

			Some solutions for 8X3
..0..2..1....0..1..2....0..1..2....0..2..1....0..2..1....0..2..1....0..1..2
..7..4..5....3..8..5....3..4..5....3..5..4....7..5..4....3..5..4....4..3..5
..6..3..8...10.11..4....6..8..7....6..7..8....6..3..8...10.11..8....6..8..7
..9.14.11....9..6..7...10..9.11...13.10.11....9.10.11....9..6..7...10..9.11
.12.13.10...16.17.14...16.17.14...16..9.14...12.13.14...13.17.14...13.12.14
.16.15.17...15.12.13...15.12.13...15.12.17...19.15.17...15.12.16...19.20.17
.22.23.20...18.20.19...18.19.20...19.18.20...18.20.16...18.19.20...18.15.16
.21.18.19...22.21.23...21.22.23...21.23.22...21.22.23...22.21.23...22.21.23
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..31