OFFSET
1,2
COMMENTS
LINKS
Indranil Ghosh, Table of n, a(n) for n = 1..1000
FORMULA
EXAMPLE
PROG
(Python)
from sympy import primerange, factorint
from operator import mul
def P(n): return reduce(mul, [i for i in primerange(2, n + 1)])
def a181811(n):
f = factorint(n)
return 1 if n==1 else (reduce(mul, [P(i)**f[i] for i in f]))/n
def a(n): return a181811(2*n - 1) # Indranil Ghosh, May 15 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Matthew Vandermast, Nov 30 2010
STATUS
approved