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A136016 a(n) = 9*n^2-1. 5
8, 35, 80, 143, 224, 323, 440, 575, 728, 899, 1088, 1295, 1520, 1763, 2024, 2303, 2600, 2915, 3248, 3599, 3968, 4355, 4760, 5183, 5624, 6083, 6560, 7055, 7568, 8099, 8648, 9215, 9800, 10403, 11024, 11663, 12320, 12995, 13688, 14399, 15128, 15875, 16640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..3000

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

FORMULA

a(n) = A005563(3*n-1). - Paul Curtz, Oct 28 2008

a(2*n) = A136017(n). - Paul Curtz, Sep 30 2008

a(n) = A016777(n)*A016789(n-1). - Reinhard Zumkeller, Feb 15 2009

G.f. x*(-8-11*x+x^2) / ( x-1 )^3 . - R. J. Mathar, Jul 01 2011

MATHEMATICA

Table[9n^2 - 1, {n, 1, 100}]

LinearRecurrence[{3, -3, 1}, {8, 35, 80}, 50] (* Harvey P. Dale, Oct 09 2012 *)

PROG

(MAGMA) [9*n^2-1: n in [1..50]]; // Vincenzo Librandi, May 09 2011

(PARI) a(n)=9*n^2-1 \\ Charles R Greathouse IV, Oct 07 2015

CROSSREFS

Cf. A001359, A006512, A037074.

Sequence in context: A281147 A217187 A214725 * A257454 A305672 A100907

Adjacent sequences:  A136013 A136014 A136015 * A136017 A136018 A136019

KEYWORD

nonn,easy

AUTHOR

Artur Jasinski, Dec 10 2007

STATUS

approved

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Last modified October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)