A264516 Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.

2, 2, 42, 228, 1644, 10368, 65182, 414414, 2603670, 16540506, 104489208, 662121980, 4188014160, 26506383680, 167699955140, 1061128778004, 6714156638826, 42483540261942, 268814679252084, 1700917160828256, 10762539724166324

Offset: 1

Author

R. H. Hardin, Nov 16 2015

Keywords

• nonn

Comments

Column 4 of A264520.

Examples

			Some solutions for n=4
..5..6..0..8..9....7..8..0..1..2....7..6..9..1..2....7..8..0..1..2
.12..1..2..3..4...12.13.14..3..4....0.13..5..3..4...12.11.14..3..4
.17.18..7.11.19....5..6.19.18..9...17.18.10..8.12....5..6.19.18..9
.10.23.24.13.14...10.11.24.23.17...22.11.24.23.14...10.23.24.13.17
.15.16.20.21.22...15.16.20.21.22...15.16.20.21.19...15.16.20.21.22
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 84

Crossrefs

Cf. A264520.

Formula

Empirical recurrence of order 84 (see link above)