Search: id:A039941
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%I A039941
%S A039941 0,1,1,1,2,2,4,8,12,96,108,10368,10476,108615168,108625644,
%T A039941 11798392572168192,11798392680793836,139202068568601556987554268864512,
%U A039941 139202068568601568785946949658348
%N A039941 Alternately add and multiply.
%H A039941 A. V. Aho and N. J. A. Sloane, <a href="http://www.research.att.com/~njas/
               doc/doubly.html">Some doubly exponential sequences</a>, Fib. Quart., 
               11 (1973), 429-437.
%F A039941 a(2n) = a(2n-1) + a(2n-2); a(2n+1) = a(2n-1)*a(2n); a(0) = 0; a(1) = 
               1
%F A039941 a(n)={a(n-1)+a(n-2), n even, a(n-1)*a(n-2), n odd}. a(0)=0. a(1)=1.
%o A039941 (PARI) a(n)=if(n<2,n>0, if(n%2,a(n-1)*a(n-2),a(n-1)+a(n-2)))
%Y A039941 A001696(n)=A039941(2*n), A001697(n)=A039941(2*n+1).
%Y A039941 Sequence in context: A153996 A123024 A079092 this_sequence A104700 A036761 
               A042979
%Y A039941 Adjacent sequences: A039938 A039939 A039940 this_sequence A039942 A039943 
               A039944
%K A039941 easy,nonn,nice
%O A039941 0,5
%A A039941 Walter G. Carlini (541carlini(AT)charter.net)
%E A039941 Additional comments from Michael Somos, May 19, 2000

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