A264487 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

1, 8, 108, 788, 21466, 142352, 2870927, 30309632, 463508815, 5517128232, 80746395988, 996650042932, 14098841570856, 180039273539208, 2481030453759277, 32286677930222166, 438951446059251344

Offset: 1

Author

R. H. Hardin, Nov 14 2015

Keywords

• nonn

Comments

Column 4 of A264490.

Examples

			Some solutions for n=4
.12..6..7..4..9....5..6..7..4..9....5..6..7..8..9....5..6..7..8..9
..0..1..2..3.14....0.18.12.13.14...10..1.12.13..4...10.11..2..3..4
..5.16.17.18.19...15.16..1..2..3...11..0.24..2..3...22..0..1.18.19
.20.21.22.23..8...20.11.22.23..8...20.21.22.23.14...20.21.12.23.14
.15.10.11.24.13...21.10.17.24.19...15.16.17.18.19...15.16.17.24.13
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..138

Crossrefs

Cf. A264490.