a(n) = Sum_{k=0..n} 3^k * 2^(n-k) * Stirling2(n,k).
A390887
a(n) = Sum_{k=0..n} 3^k * 2^(n-k) * Stirling2(n,k).
Terms
- a(0) =1a(1) =3a(2) =15a(3) =93a(4) =681a(5) =5691a(6) =53079a(7) =544053a(8) =6058545a(9) =72652179a(10) =931542207a(11) =12697268205a(12) =183092096409
External references
- oeis: A390887