0,2

Partial sums of A011865 are a(n)=sum{k=0..n, floor(C(k+2,4)/C(k+2,2))}.

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)].

Sequence in context: A038045 A095233 A062434 this_sequence A011911 A078346 A122051

Adjacent sequences: A084264 A084265 A084266 this_sequence A084268 A084269 A084270

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jun 01 2003