A259323 2*A259322(n).

2, 1460, 32710, 268008, 1330890, 4874012, 14527630, 37308880, 85584018, 179675780, 351208022, 647279800, 1135561050, 1910402028, 3100048670, 4875056032, 7457991970, 11134523220, 16265976038, 23303463560, 32803672042, 45446398140, 62053929390, 83612360048, 111294934450, 146487510052

Offset

1,1

Links

Colin Barker, Table of n, a(n) for n = 1..1000

J. L. Bailey, Jr., A table to facilitate the fitting of certain logistic curves, Annals Math. Stat., 2 (1931), 355-359.

J. L. Bailey, A table to facilitate the fitting of certain logistic curves, Annals Math. Stat., 2 (1931), 355-359. [Annotated scanned copy]

Index entries for linear recurrences with constant coefficients, signature (8,-28,56,-70,56,-28,8,-1).

Formula

a(n) = 2*(n*(-31+196*n^2-336*n^4+192*n^6))/21. - Colin Barker, Jun 29 2015

G.f.: 2*x*(x^6+722*x^5+10543*x^4+23548*x^3+10543*x^2+722*x+1) / (x-1)^8. - Colin Barker, Jun 29 2015

Prog

(PARI) Vec(2*x*(x^6+722*x^5+10543*x^4+23548*x^3+10543*x^2+722*x+1)/(x-1)^8 + O(x^100)) \\ Colin Barker, Jun 29 2015
(PARI) a(n) = n*(384*n^6-672*n^4+392*n^2-62)/21 \\ Charles R Greathouse IV, Jun 29 2015

Crossrefs

Cf. A259322.

Sequence in context: A173131 A160087 A170993 * A172939 A172234 A339543

Adjacent sequences: A259320 A259321 A259322 * A259324 A259325 A259326

Keyword

nonn,easy

Author

N. J. A. Sloane, Jun 24 2015

Status

approved