a(n) = Sum_{i=0..n} 2^i*B(i)*binomial(n,i) where B(n) = Bell numbers A000110(n).
A126390
a(n) = Sum_{i=0..n} 2^i*B(i)*binomial(n,i) where B(n) = Bell numbers A000110(n).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =71a(4) =457a(5) =3355a(6) =27509a(7) =248127a(8) =2434129a(9) =25741939a(10) =291397789a(11) =3510328695a(12) =44782460313a(13) =602513988107
External references
- oeis: A126390