OFFSET
0,2
COMMENTS
Named after the American chemist and physician Harry Wiener (1924-1988). - Amiram Eldar, Jun 13 2021
REFERENCES
Wai Chee Shiu, C. S. Tong and P. C. B. Lam, Wiener number of some polycyclic graphs, Graph Theory Notes of New York, Vol. 32, No. 2 (1997), pp. 10-15.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1).
FORMULA
a(n) = (1/10)*n*(n+1)*(4*n^3+36*n^2+79*n+16).
G.f.: 3*x*(2*x^3-11*x^2+16*x+9)/(x-1)^6. [Colin Barker, Oct 30 2012]
MATHEMATICA
CoefficientList[Series[3 x (2 x^3 - 11 x^2 + 16 x + 9)/(x - 1)^6, {x, 0, 30}], x] (* Vincenzo Librandi, Oct 20 2013 *)
PROG
(Magma) [(1/10)*n*(n+1)*(4*n^3+36*n^2+79*n+16): n in [0..30]]; // Vincenzo Librandi, Oct 20 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from Vincenzo Librandi, Oct 20 2013
STATUS
approved