OFFSET
1,2
COMMENTS
This is also binomial(n, cototient(n)). - Franklin T. Adams-Watters, Jul 13 2014
LINKS
Harry J. Smith, Table of n, a(n) for n=1..300
EXAMPLE
a(6) = binomial(6, phi(6)) = binomial(6, 2) = 6!/(2!*4!) = 15.
MAPLE
seq(binomial(n, numtheory:-phi(n)), n=1..100); # Robert Israel, Jul 13 2014
MATHEMATICA
Map[Binomial[#, EulerPhi[#]] &, Range[80]] (* Carl Najafi, Aug 30 2011 *)
PROG
(PARI) { for (n=1, 300, a=binomial(n, eulerphi(n)); write("b066449.txt", n, " ", a) ) } \\ Harry J. Smith, Feb 15 2010
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Joseph L. Pe, Dec 28 2001
EXTENSIONS
a(16) - a(38) from Harry J. Smith, Feb 15 2010
STATUS
approved