The next term is too large to include.
Table of n, a(n) for n=1..5.
For n = 4: a(4) = 4^2 - 1 = 15.
Sequence in context: A175981 A056072 A294195 * A136666 A031361 A155955
Adjacent sequences: A175979 A175980 A175981 * A175983 A175984 A175985
Jaroslav Krizek, Nov 03 2010