A264016 Number of (n+1) X (7+1) arrays of permutations of 0..n*8+7 with each element having index change +-(.,.) 0,0 1,2 or 2,2.

64, 7921, 1464100, 146410000, 17394972100, 2089022169025, 252579343635025, 30557658560100100, 3696969485250250000, 447272452462938576100, 54112631066129736180025, 6546741114347411138472025

Offset

1,1

Comments

Column 7 of A264017.

Links

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

Formula

Empirical: a(n) = 130*a(n-1) -1191*a(n-2) +13340*a(n-3) -146501*a(n-4) -159459*a(n-5) -1321*a(n-6) +1321*a(n-7) +159459*a(n-8) +146501*a(n-9) -13340*a(n-10) +1191*a(n-11) -130*a(n-12) +a(n-13) for n>15.

Example

Some solutions for n=2
..0.11.20..3.14.15..6..7....0..1.12..3.22..5..6..7...10..1..2..3.14.15..6..7
.18..9.10..1.22.13..4..5....8..9.20.11..2.23.14.15...18..9..0.21.12.23..4..5
.16.17..8.19..2.21.12.23...16.17.18.19.10.21..4.13...16.17..8.19.20.11.22.13

Crossrefs

Cf. A264017.

Sequence in context: A075417 A294083 A084004 * A160448 A302271 A301847

Adjacent sequences: A264013 A264014 A264015 * A264017 A264018 A264019

Keyword

nonn

Author

R. H. Hardin, Nov 01 2015

Status

approved