a(n) = Sum_{k=0..n} E2(n, k)*2^k, where E2(n, k) are the second-order Eulerian numbers A340556.
A112487
a(n) = Sum_{k=0..n} E2(n, k)*2^k, where E2(n, k) are the second-order Eulerian numbers A340556.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =82a(4) =938a(5) =13778a(6) =247210a(7) =5240338a(8) =128149802a(9) =3551246162a(10) =109979486890
External references
- oeis: A112487