OFFSET
0,3
MAPLE
with(numtheory):with(combinat):a:=n->phi(binomial(2*n, n)*n^3): seq(a(n), n=0..22);
MATHEMATICA
Table[EulerPhi[Binomial[2n, n]n^3], {n, 0, 20}] (* Harvey P. Dale, May 10 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zerinvary Lajos, Oct 07 2007
STATUS
approved