A264572 Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change 1,0 1,1 0,-1 or -1,1.

2, 8, 31, 192, 1130, 8356, 47571, 305844, 1871556, 11815440, 73467099, 457338532, 2850911356, 17771612880, 110773680091, 690026338272, 4300552632388, 26800830750202, 167010622956533, 1040699613256184, 6485315542593720

Offset: 1

Author

R. H. Hardin, Nov 17 2015

Keywords

• nonn

Comments

Row 4 of A264569.

Examples

			Some solutions for n=4
..1..5..3..4..8....1..2..3..4..8....1..2..3..7..8....1..2..6..7..8
..0.10..2.12.13....0.10.11..9.13....6..0.11..9..4....0.10.11..3..4
.11..6..7.14..9....5..6..7.14.18....5.12.13.14.18....5.15.13.17..9
.16.20.18.22.23...16.20.12.22.23...10.20.21.22.23...16.20.12.19.14
.21.15.17.24.19...21.15.17.24.19...15.16.17.24.19...21.22.23.24.18
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 56

Crossrefs

Cf. A264569.

Formula

Empirical recurrence of order 56 (see link above)