OFFSET
0,4
LINKS
R. Stanley, Parking Functions, 2011
FORMULA
a(2n) = A260694(2n).
EXAMPLE
a(3) = 3: 212, 213, 312.
a(4) = 17: 2121, 2131, 2132, 2141, 2142, 2143, 3121, 3131, 3132, 3141, 3142, 3231, 3241, 4121, 4131, 4132, 4231.
a(5) = 104: 21212, 21213, 21214, 21215, ..., 52314, 52412, 52413, 53412.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 29 2015
STATUS
approved