A064843 a(n) = A064842(n)/2.

0, 1, 3, 9, 18, 33, 53, 81, 116, 161, 215, 281, 358, 449, 553, 673, 808, 961, 1131, 1321, 1530, 1761, 2013, 2289, 2588, 2913, 3263, 3641, 4046, 4481, 4945, 5441, 5968, 6529, 7123, 7753, 8418, 9121, 9861, 10641, 11460, 12321, 13223, 14169

Offset: 1

Author

N. J. A. Sloane, Oct 25 2001

Keywords

• nonn
• easy

Comments

Partial sums of A084265. - N. J. A. Sloane, Jul 20 2008

Links

• Index entries for linear recurrences with constant coefficients, signature (3,-2,-2,3,-1).

Crossrefs

Cf. A064842, A084265.

Formula

G.f.: -x^2*(-1+x^3-2*x^2) / ( (1+x)*(x-1)^4 ). - R. J. Mathar, Nov 26 2012