A264069 Number of (n+1) X (6+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 1,1 or 1,2.

233, 15125, 1445345, 130697424, 11909009849, 1084282319384, 98725402363225, 8989061417123964, 818464496640651553, 74522143720797473932, 6785327805998071795553, 617811983591878946983992, 56252499213505961292639449, 5121855437908705959886793744, 466350890958042737691769834681

Offset

1,1

Links

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

Formula

Empirical: a(n) = 87*a(n-1) +374*a(n-2) -470*a(n-3) +207*a(n-4) +3*a(n-5) for n > 7.

Example

Some solutions for n=2:
..9..1..2..3..4.13..6....0..1..2..3..4..5..6....8..9..2.12.13..5..6
.15..0.17.18.19.20..5....7.16.18.19.11.12.13...15..0.18..1.19..3..4
.14..7.16..8.10.11.12...14.15..8.17..9.10.20...14..7.16.17.10.11.20

Crossrefs

Column 6 of A264071.

Sequence in context: A201834 A201214 A232322 * A269548 A264021 A375344

Adjacent sequences: A264066 A264067 A264068 * A264070 A264071 A264072

Keyword

nonn

Author

R. H. Hardin, Nov 02 2015

Status

approved