OFFSET
1,1
EXAMPLE
n=6, A002110(6)=30030, C(6,3)=20 with squarefree kernel 10. So a(6) = 30030/10 = 3003 = 3*7*11*13, also squarefree.
PROG
(PARI) a(n) = prod(k=1, n, prime(k))/factorback(factor(binomial(n, n\2))[, 1]); \\ Michel Marcus, Jul 13 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 07 2000
STATUS
approved