OFFSET
0,2
COMMENTS
Partial sums of A011865 are a(n)=sum{k=0..n, floor(C(k+2,4)/C(k+2,2))}.
LINKS
Index entries for linear recurrences with constant coefficients, signature (3,-3,2,-3,3,-2,3,-3,2,-3,3,-1).
FORMULA
a(n)=sum{k=0..n, floor(C(k+4, 4)/C(k+2, 2))}
G.f.: (x^4-x^3+x^2-x+1)/[(1-x)^4(1+x^2)(1+x+x^2)(1-x^2+x^4)].
MATHEMATICA
Accumulate[Table[Floor[Binomial[n, 4]/Binomial[n, 2]], {n, 6, 70}]] (* Harvey P. Dale, Jul 19 2012 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Jun 01 2003
STATUS
approved