G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k - x) / (1 - k*x + x^2).
A231352
G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k - x) / (1 - k*x + x^2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =8a(4) =50a(5) =382a(6) =3434a(7) =35694a(8) =421682a(9) =5582158a(10) =81860978a(11) =1317457646a(12) =23087951666a(13) =437673142510
External references
- oeis: A231352