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A033583 a(n) = 10*n^2. 25
0, 10, 40, 90, 160, 250, 360, 490, 640, 810, 1000, 1210, 1440, 1690, 1960, 2250, 2560, 2890, 3240, 3610, 4000, 4410, 4840, 5290, 5760, 6250, 6760, 7290, 7840, 8410, 9000, 9610, 10240, 10890, 11560, 12250, 12960, 13690, 14440, 15210, 16000, 16810 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Number of edges of a complete 5-partite graph of order 5n, K_n,n,n,n,n. - Roberto E. Martinez II, Oct 18 2001

10 times the squares. [From Omar E. Pol, Dec 13 2008]

Sequence found by reading the line from 0, in the direction 0, 10,..., in the square spiral whose vertices are the generalized heptagonal numbers A085787. - Omar E. Pol, Sep 10 2011

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 0..10000

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

FORMULA

a(n) = A000290(n)*10 = A001105(n)*5 = A033429(n)*2. [Omar E. Pol, Dec 13 2008]

a(n) = A158187(n) - 1. [Reinhard Zumkeller, Mar 13 2009]

a(n) = 20*n+a(n-1)-10 (with a(0)=0) [Vincenzo Librandi, Aug 05 2010]

MAPLE

seq(10*n^2, n=0..41); # Nathaniel Johnston, Jun 26 2011

MATHEMATICA

10*Range[0, 50]^2  (* Harvey P. Dale, Apr 20 2011 *)

CROSSREFS

Cf. A033581, A000217, A000290, A033428.

Cf. A001105, A033429. [From Omar E. Pol, Dec 13 2008]

Sequence in context: A217073 A210376 A060317 * A131037 A071233 A063490

Adjacent sequences:  A033580 A033581 A033582 * A033584 A033585 A033586

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 25 11:25 EDT 2017. Contains 284076 sequences.