Search: id:A161178
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%I A161178
%S A161178 1,1,2,3,8,15,48,105,384,945,2,2,3,4,9,16,49,106,385,946,3,3,4,5,10,17,
%T A161178 50,107,386,947,4,4,5,6,11,18,51,108,387,948,9,9,10,11,16,23,56,113,392,
%U A161178 953,16,16,17,18,23,30,63,120,399,960,49,49,50,51,56,63,96,153,432,993
%N A161178 Sum of double factorials of the digits of n.
%e A161178 a(24) = (2!!) + (4!!) = 2 + 8 = 10. a(35) = (3!!) + (5!!) = 3 + 15 = 
               18.
%p A161178 P:=proc(i) local a,b,c,n; print(1); for n from 1 by 1 to i do a:=0; b:=n; 
               while b>0 do c:=10*frac(b/10); a:=a+doublefactorial(c); b:=trunc(b/
               10); od; print(a); od; end: P(100);
%Y A161178 A061602
%Y A161178 Sequence in context: A148010 A148011 A148012 this_sequence A006882 A080498 
               A148013
%Y A161178 Adjacent sequences: A161175 A161176 A161177 this_sequence A161179 A161180 
               A161181
%K A161178 easy,nonn,uned
%O A161178 0,3
%A A161178 Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Jun 05 2009

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