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A064199 a(n) = 9*(n-2)^2*(n^2-2*n-1)/2. 1
0, 9, 126, 567, 1656, 3825, 7614, 13671, 22752, 35721, 53550, 77319, 108216, 147537, 196686, 257175, 330624, 418761, 523422, 646551, 790200, 956529, 1147806, 1366407, 1614816, 1895625, 2211534, 2565351, 2959992, 3398481 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

REFERENCES

L. Berzolari, Allgemeine Theorie der Höheren Ebenen Algebraischen Kurven, Encyclopädie der Mathematischen Wissenschaften mit Einschluss ihrer Anwendungen. Band III_2. Heft 3, Leipzig: B. G. Teubner, 1906. p. 341.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 2..1000

FORMULA

G.f.: 9*x^3*(1+9*x+3*x^2-x^3)/(1-x)^5. - Colin Barker, Feb 28 2012

MATHEMATICA

Table[9*(n-2)^2*(n^2-2*n-1)/2, {n, 2, 40}] (* Vincenzo Librandi, Feb 29 2012 *)

PROG

(Magma) [9*(n-2)^2*(n^2-2*n-1)/2: n in [2..30]]; // Vincenzo Librandi, Feb 29 2012

CROSSREFS

Sequence in context: A291897 A324201 A224495 * A092343 A261176 A261743

Adjacent sequences: A064196 A064197 A064198 * A064200 A064201 A064202

KEYWORD

nonn,easy

AUTHOR

Antreas P. Hatzipolakis (xpolakis(AT)otenet.gr), Sep 22 2001

STATUS

approved

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Last modified December 7 23:32 EST 2022. Contains 358671 sequences. (Running on oeis4.)