2,2

Table of n, a(n) for n=2..79.

Join[{0}, Table[Total[Transpose[FactorInteger[Binomial[3n, n-2]]][[2]]], {n, 3, 80}]] (* Harvey P. Dale, Sep 23 2014 *)

Sequence in context: A119322 A014498 A186286 * A187754 A075258 A212629

Adjacent sequences: A023818 A023819 A023820 * A023822 A023823 A023824

nonn

Clark Kimberling

approved