A264425 Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change 0,1 2,2 1,0 -1,2 -2,-1 or -1,-1.

1, 85, 529, 7311, 101862, 1103666, 13805196, 169633649, 2021225139, 24679272503, 299292066678, 3620259337857, 43944809107738, 532640833103943, 6455594272133455, 78276807986884628, 948887621876714100

Offset: 1

Author

R. H. Hardin, Nov 12 2015

Keywords

• nonn

Comments

Row 4 of A264422.

Examples

			Some solutions for n=4
..6..0..1..9..3....6..7..8..2..3....6..7..1..9..3....6.12..1..9..7
.11..5.13..7..4...16.12.13.11..4....0.12.13.19..4....0..5..2..3..4
.16.17.23..8..2....5.17..0..1..9....5.17.18..8..2...16.17.11..8.13
.10.22.12.24.14...10.22.23.24.14...10.11.16.24.14...21.22.23.24.14
.15.20.21.18.19...15.20.21.18.19...15.20.21.22.23...15.20.10.18.19
		

Links

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

Crossrefs

Cf. A264422.

Formula

Empirical: a(n) = a(n-1) +66*a(n-2) +767*a(n-3) +1772*a(n-4) -5737*a(n-5) -60500*a(n-6) -147478*a(n-7) +248837*a(n-8) +915581*a(n-9) -595548*a(n-10) +1256272*a(n-11) +6424752*a(n-12) +2523024*a(n-13) [phone]*a(n-14) [phone]*a(n-15) -24975872*a(n-16) for n>18