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A178426
11 followed by the Fermat numbers A152585.
2
11, 13, 145, 20737, 429981697, 184884258895036417, 34182189187166852111368841966125057, 1168422057627266461843148138873451659428421700563161428957815831003137
OFFSET
0,1
COMMENTS
If a(0)=3, the recursion formula gives A000215.
FORMULA
a(0)=11. a(n)= 2 + Product_{i=0..n-1} a(i).
MATHEMATICA
a[0] := 11;
a[n_] := a[n] = Product[a[i], {i, 0, n - 1}] + 2;
Table[a[n], {n, 0, 10}]
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Roger L. Bagula, May 27 2010
EXTENSIONS
Definition simplified by the Assoc. Eds. of the OEIS - May 28 2010
STATUS
approved