1,2

a(n) = ((n + 1)^(n^2) - 1)/n^3

Table[ ((n + 1)^(n^2) - 1)/n^3, {n, 1, 10} ]

Cf. A137642 = ((p + 1)^(p^2) - 1)/p^3 for p = prime[n]. Cf. A133591 = ((p - 1)^(p^2) + 1)/p^3 for p = prime[n].

Sequence in context: A125543 A109893 A125544 this_sequence A137642 A013746 A076782

Adjacent sequences: A137638 A137639 A137640 this_sequence A137642 A137643 A137644

nonn

Alexander Adamchuk (alex(AT)kolmogorov.com), Jan 31 2008