A024201 [ (2nd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+1 odd positive integers}.

0, 2, 5, 9, 14, 19, 26, 34, 43, 53, 64, 75, 88, 102, 117, 133, 150, 167, 186, 206, 227, 249, 272, 295, 320, 346, 373, 401, 430, 459, 490, 522, 555, 589, 624, 659, 696, 734, 773, 813, 854, 895, 938, 982

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Formula

Empirical g.f.: x^2*(x^6-2*x^5-x^3-x^2-x-2) / ((x-1)^3*(x+1)*(x^2-x+1)*(x^2+x+1)). - Colin Barker, Aug 15 2014

a(n) = floor( A024196(n)/(1+n)^2). - R. J. Mathar, Sep 23 2016