E.g.f. ( 1-x-sqrt(1-2*x+x^2-4*x^3) )/(2*x^2).
A052743
E.g.f. ( 1-x-sqrt(1-2*x+x^2-4*x^3) )/(2*x^2).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =48a(5) =480a(6) =5040a(7) =65520a(8) =1048320a(9) =18869760a(10) =377395200a(11) =8462361600a(12) =209802700800
External references
- oeis: A052743