OFFSET
0,2
REFERENCES
S. Mukai, An Introduction to Invariants and Moduli, Cambridge, 2003; see p. 483.
FORMULA
a(n) = 1 + (n^2+n)*(n^2+n+1)*10/3. a(-1-n)= a(n). - Michael Somos, Mar 20 2007
G.f.: (1 + 16*x + 46*x^2 + 16*x^3 + x^4)/(1-x)^5. - Michael Somos, Mar 20 2007; corrected by Georg Fischer, Apr 17 2020
MATHEMATICA
nn:=31; CoefficientList[Series[(1 + 16*x + 46*x^2 + 16*x^3 + x^4)/(1-x
)^5, {x, 0, nn}], x] (* Georg Fischer, Apr 17 2020 *)
PROG
(PARI) {a(n)= 1+ (n^2+n)* (n^2+n+1)* 10/3} /* Michael Somos, Mar 20 2007 */
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 10 2005
EXTENSIONS
More terms from Michael Somos, Mar 20 2007
STATUS
approved