OFFSET
1,2
COMMENTS
FORMULA
a(1) = 1, a(2) = 2, a(n) = a(n-1)*A006519(n) + a(n-2).
EXAMPLE
The constant is x=1.353871128429882374388894084016608124227333416812...
contfrac(x) = [1;2,1,4,1,2,1,8,1,2,1,4,1,2,1,16,...A006519(n),... ].
PROG
(PARI) a(n)=if(n==1, 1, if(n==2, 2, a(n-1)*2^valuation(n, 2)+a(n-2)))
CROSSREFS
KEYWORD
cofr,nonn
AUTHOR
Paul D. Hanna, Nov 18 2004
STATUS
approved