OFFSET
2,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 2..380
Peter J. Cameron, Daniel Johannsen, Thomas Prellberg and Pascal Schweitzer, Counting Defective Parking Functions
FORMULA
a(n) = 2*(n+2)^(n-1)-(3*n+1)*(n+1)^(n-2). - Vladeta Jovovic, Jul 21 2008
a(n) ~ (2*exp(2) - 3*exp(1)) * n^(n-1). - Vaclav Kotesovec, Aug 19 2017
EXAMPLE
a(3) = 10: [1,3,3], [2,2,2], [2,2,3], [2,3,2], [2,3,3], [3,1,3], [3,2,2], [3,2,3], [3,3,1], [3,3,2].
CROSSREFS
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Jul 09 2008
EXTENSIONS
Extended beyond a(10) by R. J. Mathar, Aug 09 2008
STATUS
approved