%I A076795
%S A076795 0,1,2,5,20,125,1070,11465,146600,2173625,36633050,691362125,
%T A076795 14440672700,330674815925,8236528396550,221694575073425,
%U A076795 6411977928702800,198310761891213425,6530970632654064050
%N A076795 Partial sums of (2n-1)!!.
%F A076795 E.g.f.: exp(x)* Integral_{t=0, x} exp(-t)/sqrt(1-2*t) dt.
%F A076795 a(n)=a(n-1)(2n-2)-a(n-2)(2n-3) . a(n) ~ 1/sqrt(2)/n * 2^n * (n/e)^n.
%o A076795 (PARI) a(n)=if(n<0,0,sum(k=0,n-1,(2*k)!/k!/2^k))
%Y A076795 Cf. A001147.
%Y A076795 Sequence in context: A144503 A012321 A012519 this_sequence A130293 A156073 
               A006366
%Y A076795 Adjacent sequences: A076792 A076793 A076794 this_sequence A076796 A076797 
               A076798
%K A076795 nonn
%O A076795 0,3
%A A076795 Michael Somos, Nov 16 2002