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A264185 Number of (n+1) X (3+1) arrays of permutations of 0..n*4+3 with each element having index change +-(.,.) 0,0 1,-1 or 2,2. 1
8, 81, 720, 7056, 70560, 705600, 7056000, 70560000, 705600000, 7056000000, 70560000000, 705600000000, 7056000000000, 70560000000000, 705600000000000, 7056000000000000, 70560000000000000, 705600000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) for n>4.

Conjectures from Colin Barker, Jan 05 2019: (Start)

G.f.: x*(8 + x - 90*x^2 - 144*x^3) / (1 - 10*x).

a(n) = 441*2^n * 5^(n-4) for n>3.

(End)

EXAMPLE

Some solutions for n=4:

..0.11..2..6...10.11..2..3....0.11..2..6....0..1..2..6...10..4..2..3

..1..5..3..7....4..8..6..7....1..5..3..7....4.15..3.10....1.15..6..7

.18..9.10.14...18.12..0..1....8.19.13.14....5.19..7.11...18..9..0.11

.12.16..4.15....9.16.14..5...12.10..4.18...12.13.17.18...12.13.17..5

.13.17..8.19...13.17.15.19...16.17.15..9...16.14..8..9...16.14..8.19

CROSSREFS

Column 3 of A264190.

Sequence in context: A240632 A007792 A301837 * A302065 A098308 A055996

Adjacent sequences:  A264182 A264183 A264184 * A264186 A264187 A264188

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 06 2015

STATUS

approved

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Last modified June 29 21:05 EDT 2022. Contains 354913 sequences. (Running on oeis4.)