a(n) = exp(-1/4) * Sum_{k>=0} (4*k - 1)^n / (4^k * k!).
A337040
a(n) = exp(-1/4) * Sum_{k>=0} (4*k - 1)^n / (4^k * k!).
Terms
- a(0) =1a(1) =0a(2) =4a(3) =16a(4) =112a(5) =896a(6) =8384a(7) =88320a(8) =1032448a(9) =13242368a(10) =184591360a(11) =2773929984a(12) =44641579008a(13) =765196926976
External references
- oeis: A337040