E.g.f. (1-sqrt(1-4x-4x^2))/2 -x*(1+x).
A052739
E.g.f. (1-sqrt(1-4x-4x^2))/2 -x*(1+x).
Terms
- a(0) =0a(1) =0a(2) =2a(3) =24a(4) =288a(5) =4800a(6) =103680a(7) =2741760a(8) =85800960a(9) =3100446720a(10) =127037030400
External references
- oeis: A052739
A052739
E.g.f. (1-sqrt(1-4x-4x^2))/2 -x*(1+x).