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return 1 if n==1 else (reduce(mul, [P(i)**f[i] for i in f]))/n
Indranil Ghosh, <a href="/A181812/b181812.txt">Table of n, a(n) for n = 1..1000</a>
(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
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_Matthew Vandermast (ghodges14(AT)comcast.net), _, Nov 30 2010
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1, 2, 6, 30, 4, 210, 2310, 12, 30030, 510510, 60, 9699690, 36, 8, 223092870, 6469693230, 420, 180, 200560490130, 4620, 7420738134810, 304250263527210, 24, 13082761331670030, 900, 60060, 614889782588491410, 1260, 1021020, 32589158477190044730
1,2
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nonn
Matthew Vandermast (ghodges14(AT)comcast.net), Nov 30 2010
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allocated for Matthew Vandermast
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