OFFSET
1,3
COMMENTS
The terms have an interesting factorization pattern, often sharing factors.
The next term (a(13)) has 82 digits. - Harvey P. Dale, Feb 27 2015
MATHEMATICA
RecurrenceTable[{a[1]==a[2]==1, a[n]==(a[n-1]+1)(a[n-2]+1)}, a, {n, 15}] (* Harvey P. Dale, Feb 27 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Gerald McGarvey, Aug 08 2004
STATUS
approved