A064199 a(n) = 9*(n-2)^2*(n^2-2*n-1)/2.

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

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