Search: id:A113845
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%I A113845
%S A113845 1,1,2,3,7,43,905,817217,222613996891,49556991610450473684541,
%T A113845 350842202496894090472936261713260177362896247,
%U A113845 123090251052871637971528096077183553457511351225922468278558723122652153910477674845042677
%N A113845 a(1) =a(2) =1. a(n+1) = (product{1<=k<=n/2} a(k)) + (product{n/2<j<=n} 
               a(j)).
%C A113845 a(13) has 177 digits. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 
               06 2006
%H A113845 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%e A113845 (1*1*2) + (3*8*50*1202) = 1442402.
%e A113845 a(8)=(a(1)*a(2)*a(3))+(a(4)*a(5)*a(6)*a(7))=(1*1*2)+(3*7*43*905)=817217.
%p A113845 a[1]:=1: a[2]:=1: for n from 2 to 12 do a[n+1]:=product(a[k],k=1..floor(n/
               2))+product(a[j],j=1+floor(n/2)..n) od:seq(a[n],n=1..12); - Emeric 
               Deutsch (deutsch(AT)duke.poly.edu), Feb 06 2006
%Y A113845 Sequence in context: A072714 A051786 A133400 this_sequence A072713 A129871 
               A000058
%Y A113845 Adjacent sequences: A113842 A113843 A113844 this_sequence A113846 A113847 
               A113848
%K A113845 easy,nonn
%O A113845 1,3
%A A113845 Leroy Quet Jan 24 2006
%E A113845 Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), 
               Feb 06 2006

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