a(n) = Sum_{k=0..n} 2^k * 5^(n-k) * Stirling2(n,k).
A390889
a(n) = Sum_{k=0..n} 2^k * 5^(n-k) * Stirling2(n,k).
Terms
- a(0) =1a(1) =2a(2) =14a(3) =118a(4) =1206a(5) =14582a(6) =202214a(7) =3142598a(8) =53897526a(9) =1008806742a(10) =20424419974a(11) =444041431398
External references
- oeis: A390889