A259319 a(n) = 2*A002309(n).

2, 164, 1414, 6216, 19338, 48620, 105742, 206992, 374034, 634676, 1023638, 1583320, 2364570, 3427452, 4842014, 6689056, 9060898, 12062148, 15810470, 20437352, 26088874, 32926476, 41127726, 50887088, 62416690, 75947092, 91728054, 110029304, 131141306, 155376028

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 (6,-15,20,-15,6,-1).

Formula

a(n) = (2*n*(7-40*n^2+48*n^4))/15. - Colin Barker, Jun 29 2015

G.f.: 2*x*(x^4+76*x^3+230*x^2+76*x+1) / (x-1)^6. - Colin Barker, Jun 29 2015

Prog

(PARI) Vec(2*x*(x^4+76*x^3+230*x^2+76*x+1)/(x-1)^6 + O(x^100)) \\ Colin Barker, Jun 29 2015

Crossrefs

Cf. A002309.

Sequence in context: A109420 A162904 A346720 * A230912 A339009 A139928

Adjacent sequences: A259316 A259317 A259318 * A259320 A259321 A259322

Keyword

nonn,easy

Author

N. J. A. Sloane, Jun 24 2015

Status

approved