a(n)=sum{k=floor((n+1)/2)..n, J(k+1)}, J(n)=A001045(n). 1, 1, 4, 8, 19, 37, 80, 160, 331, 661, 1344, 2688, 5419, 10837, 21760, 43520, 87211
1 seqfan posts