a(n) = 2^n * exp(-1/2) * Sum_{k>=0} (k + 2)^n / (2^k * k!).
A337011
a(n) = 2^n * exp(-1/2) * Sum_{k>=0} (k + 2)^n / (2^k * k!).
Terms
- a(0) =1a(1) =5a(2) =27a(3) =159a(4) =1025a(5) =7221a(6) =55307a(7) =457631a(8) =4065569a(9) =38566021a(10) =388757083a(11) =4146851583a(12) =46636281185a(13) =551163837685
External references
- oeis: A337011