OFFSET
0,2
COMMENTS
Partial sums of A008387.
LINKS
T. D. Noe, Table of n, a(n) for n = 0..1000
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
Index entries for linear recurrences with constant coefficients, signature (7, -21, 35, -35, 21, -7, 1).
FORMULA
a(n) = 1+7*n*(n+1)*(n^2+n+3)*(11*n^2+11*n+14)/60. - T. D. Noe, Apr 29 2007
G.f.: (1+36*x+225*x^2+400*x^3+225*x^4+36*x^5+x^6)/(1-x)^7. [Colin Barker, Mar 15 2012]
PROG
(Maxima) A008388[n]:=1+7*n*(n+1)*(n^2+n+3)*(11*n^2+11*n+14)/60$
makelist(A008388[n], n, 0, 30); /* Martin Ettl, Oct 26 2012 */
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved