E.g.f.: Sum_{n>=0} D^(n*(n-1)/2) (x + x^2)^(n*(n+1)/2) / (n*(n+1)/2)!, where operator D^n = d^n/dx^n.
A215126
E.g.f.: Sum_{n>=0} D^(n*(n-1)/2) (x + x^2)^(n*(n+1)/2) / (n*(n+1)/2)!, where operator D^n = d^n/dx^n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =103a(5) =1071a(6) =16261a(7) =310543a(8) =7712433a(9) =234935473a(10) =8704118611a(11) =385999169421
External references
- oeis: A215126