OFFSET
1,1
COMMENTS
Column 5 of A221623.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 120*a(n-1) - 4345*a(n-2) + 52950*a(n-3) - 93340*a(n-4) + 44616*a(n-5).
Empirical g.f.: x*(120 - 4345*x + 52950*x^2 - 93340*x^3 + 44616*x^4) / ((1 - x)^2*(1 - 26*x)^2*(1 - 66*x)). - Colin Barker, Aug 09 2018
EXAMPLE
Some solutions for n=3:
..1..2..3..4..5....1..2..4..3..5....1..2..4..3..5....1..2..3..5..4
..4..5..1..3..2....1..2..5..4..3....4..3..1..2..5....1..2..5..3..4
..5..1..2..4..3....3..5..4..1..2....5..3..4..1..2....1..3..4..5..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 21 2013
STATUS
approved