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A027599 a(n) = 3n^2 - 7n + 6. 3
6, 2, 4, 12, 26, 46, 72, 104, 142, 186, 236, 292, 354, 422, 496, 576, 662, 754, 852, 956, 1066, 1182, 1304, 1432, 1566, 1706, 1852, 2004, 2162, 2326, 2496, 2672, 2854, 3042, 3236, 3436, 3642, 3854, 4072, 4296, 4526, 4762, 5004, 5252, 5506 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

Encyclopaedia Britannica, 1965 ed., Vol. 16 pp. 755-756.

LINKS

Table of n, a(n) for n=0..44.

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

FORMULA

a(n) = a(n-1) + 6*n - 10 (with a(0)=6). - Vincenzo Librandi, Nov 19 2010

a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3). G.f.: 2*(3 - 8*x + 8*x^2)/(1 - x)^3. - Colin Barker, May 22 2012

MATHEMATICA

lst={}; Do[AppendTo[lst, 3*n^2-7*n+6], {n, 0, 4!}]; lst...and/or... s=2; lst={6, s}; Do[s+=n+1; AppendTo[lst, s], {n, 1, 5!, 6}]; lst (* Vladimir Joseph Stephan Orlovsky, Oct 25 2008 *)

PROG

(PARI) a(n)=3*n^2-7*n+6 \\ Charles R Greathouse IV, Jun 17 2017

CROSSREFS

Cf. A049450.

Sequence in context: A019930 A169843 A123139 * A248272 A058160 A033939

Adjacent sequences:  A027596 A027597 A027598 * A027600 A027601 A027602

KEYWORD

nonn,easy

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified January 18 20:14 EST 2018. Contains 297865 sequences.