O.g.f.: A(x) = Sum_{n>=0} x^n / Product_{k=0..n} (1 - k^2*x).
A135920
O.g.f.: A(x) = Sum_{n>=0} x^n / Product_{k=0..n} (1 - k^2*x).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =37a(5) =264a(6) =2433a(7) =27913a(8) =386906a(9) =6346119a(10) =121159373a(11) =2655174768a(12) =66028903633
External references
- oeis: A135920