%I #12 Nov 02 2017 17:50:16
%S 0,2,3,3,6,5,6,8,8,9,11,9,10,10,12,11,12,13,13,14,17,15,17,17,16,18,
%T 19,17,20,17,19,21,19,19,22,20,20,21,22,21,23,26,26,28,29,25,29,28,27,
%U 28,29,26,32,31,31,32,30,31,33,33,31,31,35,33,32,30,31,32,36,32,35,34,33,38,37,35,38,35
%N Sum of exponents in prime-power factorization of C(3n,n-2).
%H Ivan Neretin, <a href="/A023821/b023821.txt">Table of n, a(n) for n = 2..10000</a>
%t Join[{0},Table[Total[Transpose[FactorInteger[Binomial[3n,n-2]]][[2]]],{n,3,80}]] (* _Harvey P. Dale_, Sep 23 2014 *)
%K nonn
%O 2,2
%A _Clark Kimberling_