a(n) = exp(-1/6) * Sum_{k>=0} (6*k - 1)^n / (6^k * k!).
A337042
a(n) = exp(-1/6) * Sum_{k>=0} (6*k - 1)^n / (6^k * k!).
Terms
- a(0) =1a(1) =0a(2) =6a(3) =36a(4) =324a(5) =3456a(6) =43416a(7) =618192a(8) =9778320a(9) =169827840a(10) =3210376032a(11) =65540155968
External references
- oeis: A337042