a(n) = (3^(2^n)+1)/2 = A059919(n)/2, n >= 0.
2, 5, 41, 3281, 21523361, 926510094425921, 1716841910146256242328924544641
3 seqfan posts
Sat Oct 23 09:23:54 CEST 2010 [seqfan] Re: CROSSREFS
Sat Oct 23 08:39:06 CEST 2010 [seqfan] Re: CROSSREFS
Sat Oct 23 00:12:52 CEST 2010 [seqfan] CROSSREFS
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.