_Omar E. Pol (info(AT)polprimos.com), _, Dec 15 2008
OEIS Server: https://oeis.org/edit/global/157
Different from A000396.
nonn,new
nonn
a(n) = A136007(n)*(A136007(n)+1)/2.
6, 28, 496, 8128, 33550336, 8589869056, 137438691328, 2305843008139952128, 2658455991569831744654692615953842176, 14474011154664524427946373126085988481573677491474835889066354349131199152128
1,1
Cf. A000396, A136007.
Omar E. Pol (info(AT)polprimos.com), Dec 15 2008
approved