OFFSET
1,2
COMMENTS
tau(n) is the number of positive divisors of n (A000005).
FORMULA
a(n) = prod_{i=1..n} A211776(i).
MATHEMATICA
FoldList[Times, Table[Product[DivisorSigma[0, d], {d, Divisors@ n}], {n, 22}]] (* Michael De Vlieger, Dec 25 2016 *)
PROG
(Magma) [&*[&*[NumberOfDivisors(d): d in Divisors(k)]: k in [1..n]]: n in [1..100]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Dec 25 2016
STATUS
approved