E.g.f.: Sum_{n>=0} D^(n^2-n) (x + x^2)^(n^2) / (n^2)!, where operator D^n = d^n/dx^n.
A215127
E.g.f.: Sum_{n>=0} D^(n^2-n) (x + x^2)^(n^2) / (n^2)!, where operator D^n = d^n/dx^n.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =21a(4) =271a(5) =5073a(6) =149931a(7) =5629933a(8) =287996871a(9) =18574155561
External references
- oeis: A215127