OFFSET
1,3
COMMENTS
The next term (a(7)) has 217 digits.
EXAMPLE
For n = 4: a(4) = (3+1)^3 - 1 = 63.
PROG
(PARI) a(n)=if(n<=1, 1, (a(n-1)+1)^(n-1)-1); /* Joerg Arndt, Jun 10 2011 */
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jaroslav Krizek, Nov 03 2010
STATUS
approved