A264381 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 2,-2 -1,0 -1,2 1,0 or 0,-1.

1, 13, 80, 385, 2345, 14329, 88264, 538417, 3284212, 20034334, 122324128, 746763789, 4557854384, 27820780958, 169811407936, 1036520322168, 6326740063001, 38617694163183, 235716525841304, 1438783215929873

Offset: 1

Author

R. H. Hardin, Nov 12 2015

Keywords

• nonn

Comments

Row 3 of A264379.

Examples

			Some solutions for n=4
..1..6..5..8..7....1..2..5..4..9....5..2..7..4..9....5..2..3..8..7
..0.11..2.13.12....0..7..8..3.12....0..1..8..3.12....0..1.12..9..4
.15..3..4.16..9...15..6.17.16.19...15..6.13.16.17...15..6.13.16.17
.10.17.18.19.14...10.11.18.13.14...10.11.18.19.14...10.11.18.19.14
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 70

Crossrefs

Cf. A264379.

Formula

Empirical recurrence of order 70 (see link above)