OFFSET
1,2
FORMULA
a(n) = n * A056045(n) = n * Sum_{d|n} (binomial(n, d) / gcd(n, d)).
MATHEMATICA
f[n_] := Block[{d = Divisors[n]}, n*Plus @@ (Binomial[n, d])]; Table[ f[n], {n, 34}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Apr 23 2005
STATUS
approved