a(n) = exp(-1/4) * Sum_{k>=0} (4*k + 2)^n / (4^k * k!).
A355165
a(n) = exp(-1/4) * Sum_{k>=0} (4*k + 2)^n / (4^k * k!).
Terms
- a(0) =1a(1) =3a(2) =13a(3) =79a(4) =601a(5) =5339a(6) =53861a(7) =607527a(8) =7560625a(9) =102637235a(10) =1506225085a(11) =23726435583a(12) =398852249097
External references
- oeis: A355165