a(n) = Sum_{k = 1...n} binomial(k + 2^(n - k) - 1, k - 1).
A323776
a(n) = Sum_{k = 1...n} binomial(k + 2^(n - k) - 1, k - 1).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =16a(4) =40a(5) =119a(6) =450a(7) =2253a(8) =15207a(9) =139190a(10) =1731703a(11) =29335875a(12) =677864041a(13) =21400069232a(14) =924419728471
External references
- oeis: A323776