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%I #8 Nov 02 2017 16:48:22
%S 0,2,2,4,4,6,4,7,6,7,6,9,8,11,9,12,9,13,10,13,12,13,12,15,14,14,14,16,
%T 14,17,12,18,16,16,15,18,15,18,17,20,19,22,20,22,22,23,20,25,21,24,22,
%U 24,22,25,21,24,22,24,23,28,26,27,26,29,25,27,25,30,28,30,26,32,29,31,31,31,31,34,29,32
%N Sum of exponents in prime-power factorization of C(2n,n-1).
%H Ivan Neretin, <a href="/A023817/b023817.txt">Table of n, a(n) for n = 1..10000</a>
%t Join[{0},Total[FactorInteger[#][[All,2]]]&/@Table[Binomial[2n,n-1], {n,2,80}]] (* _Harvey P. Dale_, Sep 14 2016 *)
%K nonn
%O 1,2
%A _Clark Kimberling_
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