OFFSET
0,2
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 (6, -15, 20, -15, 6, -1).
FORMULA
From Gopinath A. R., Feb 14 2012, (Start)
G.f.: (x^5+7*x^4+42*x^3+22*x^2+7*x+1)/(x^6-6*x^5+15*x^4-20*x^3+15*x^2-6*x+1).
E.g.f.: 1/12*(8*x^5+95*x^4+320*x^3+360*x^2+144*x+12)*exp(x). (End)
MAPLE
2/3*n^5+5/4*n^4+5/2*n^3+15/4*n^2+23/6*n+1;
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved