A264553 Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

0, 10, 45, 216, 1528, 11728, 66372, 403920, 2587588, 16422928, 100924052, 627229368, 3931197172, 24518011160, 152485541704, 950191656704, 5926384223020, 36928044675096, 230056295804064, 1433703853124720

Offset: 1

Author

R. H. Hardin, Nov 17 2015

Keywords

• nonn

Comments

Row 4 of A264550.

Examples

			Some solutions for n=4
..1..2..3..4..7....1..2..3..6..8....1..2..5..6..8....1..5..3..4..7
..0.10.11..9.12....0..7.11..9..4....0..7.10..3..4....0.10..2..9.12
..5..6.15..8.18....5.15.16.14.18...11.12.13.17..9...11..6.13..8.18
.16.17.20.13.14...10.20.12.13.23...16.20.18.21.14...16.17.20.21.14
.21.22.23.24.19...21.22.17.24.19...15.22.23.24.19...15.22.23.24.19
		

Links

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

Crossrefs

Cf. A264550.

Formula

Empirical recurrence of order 56 (see link above)