|
Search: id:A039941
|
|
|
| A039941 |
|
Alternately add and multiply. |
|
+0
6
|
|
| 0, 1, 1, 1, 2, 2, 4, 8, 12, 96, 108, 10368, 10476, 108615168, 108625644, 11798392572168192, 11798392680793836, 139202068568601556987554268864512, 139202068568601568785946949658348
(list; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
LINKS
|
A. V. Aho and N. J. A. Sloane, Some doubly exponential sequences, Fib. Quart., 11 (1973), 429-437.
|
|
FORMULA
|
a(2n) = a(2n-1) + a(2n-2); a(2n+1) = a(2n-1)*a(2n); a(0) = 0; a(1) = 1
a(n)={a(n-1)+a(n-2), n even, a(n-1)*a(n-2), n odd}. a(0)=0. a(1)=1.
|
|
PROGRAM
|
(PARI) a(n)=if(n<2, n>0, if(n%2, a(n-1)*a(n-2), a(n-1)+a(n-2)))
|
|
CROSSREFS
|
A001696(n)=A039941(2*n), A001697(n)=A039941(2*n+1).
Sequence in context: A153996 A123024 A079092 this_sequence A104700 A036761 A042979
Adjacent sequences: A039938 A039939 A039940 this_sequence A039942 A039943 A039944
|
|
KEYWORD
|
easy,nonn,nice
|
|
AUTHOR
|
Walter G. Carlini (541carlini(AT)charter.net)
|
|
EXTENSIONS
|
Additional comments from Michael Somos, May 19, 2000
|
|
|
Search completed in 0.002 seconds
|
