a(n) = Sum_{k=0..n} (k+1) * Sum_{j=0..n} 2^j*binomial(n,j)*binomial(n-k,j).
A035029
a(n) = Sum_{k=0..n} (k+1) * Sum_{j=0..n} 2^j*binomial(n,j)*binomial(n-k,j).
Terms
- a(0) =1a(1) =5a(2) =26a(3) =138a(4) =743a(5) =4043a(6) =22180a(7) =122468a(8) =679757a(9) =3789297a(10) =21199998a(11) =118973550a(12) =669447123a(13) =3775577367a(14) =21336790152a(15) =120795829128a(16) =684962855705
External references
- oeis: A035029