A023835 - OEIS

%I #6 Nov 08 2017 16:18:47

%S 2,4,6,7,7,9,11,12,13,13,13,15,14,16,17,18,16,18,18,20,22,22,23,25,24,

%T 24,25,24,24,28,27,29,27,30,30,32,31,31,34,32,31,33,34,37,36,35,36,40,

%U 37,37,38,39,39,42,41,42,42,42,42,43,44,46,47,48,45,46,44,45,48,49,47,50,47,49,53,52,51

%N Sum of exponents in prime-power factorization of C(4n,2n-1).

%H Ivan Neretin, <a href="/A023835/b023835.txt">Table of n, a(n) for n = 1..10000</a>

%t Table[PrimeOmega[Binomial[4 n, 2 n - 1]], {n, 78}] (* _Ivan Neretin_, Nov 08 2017 *)

%K nonn

%O 1,1

%A _Clark Kimberling_

%E a(74)..a(77) corrected by _Ivan Neretin_, Nov 08 2017