a(n) = Sum_{k=0..n} Stirling2(n,k) * 2^binomial(k,2).
A335390
a(n) = Sum_{k=0..n} Stirling2(n,k) * 2^binomial(k,2).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =15a(4) =127a(5) =1895a(6) =53071a(7) =2953575a(8) =337064047a(9) =79446381319
External references
- oeis: A335390