OFFSET
1,2
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..3000 (first 200 terms from Harry J. Smith)
MATHEMATICA
us[n_] := If[n == 1, 1, Times @@ (1 + Power @@@ FactorInteger[n])]; Table[ us@ Binomial[n, Floor[n/2]], {n, 33}] (* Giovanni Resta, Jun 22 2018 *)
PROG
(PARI) usigma(n)= { my(f, s=1); f=factor(n); for(i=1, matsize(f)[1], s*=1 + f[i, 1]^f[i, 2]); return(s) }
a(n) = usigma(binomial(n, n\2)); \\ Harry J. Smith, Sep 08 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Sep 11 2001
STATUS
approved