1,2
Table of n, a(n) for n=1..8.
Index entries for sequences related to divisors of numbers
G.f.: (-1 - 2*x + 3*x^2 - 2*x^3 - x^4)/((-1 + x)^3 (1 + x + x^2)^2) [From Alexander R. Povolotsky, Oct 23 2010]
Sequence in context: A018473 A004094 A028910 * A036447 A069027 A065549
Adjacent sequences: A018479 A018480 A018481 * A018483 A018484 A018485
nonn,fini,full,easy
N. J. A. Sloane.
approved