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A082450 5*(n^2-n+2)/2. 0
5, 5, 10, 20, 35, 55, 80, 110, 145, 185, 230, 280, 335, 395, 460, 530, 605, 685, 770, 860, 955, 1055, 1160, 1270, 1385, 1505, 1630, 1760, 1895, 2035, 2180, 2330, 2485, 2645, 2810, 2980, 3155, 3335, 3520, 3710, 3905, 4105, 4310, 4520, 4735, 4955, 5180, 5410, 5645 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

REFERENCES

Found on a quiz.

LINKS

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

FORMULA

a(n)=5*n+a(n-1)-5 (with a(0)=5) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 08 2010]

CROSSREFS

Essentially 5*A000124.

Sequence in context: A138506 A000728 A022088 * A087705 A087033 A175902

Adjacent sequences:  A082447 A082448 A082449 * A082451 A082452 A082453

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Apr 25 2003

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Last modified February 15 13:35 EST 2012. Contains 205802 sequences.