G.f.: Sum_{n>=0} x^n / Product_{k=0..n} (1 - (2*k-1)*x)^2.
A216373
G.f.: Sum_{n>=0} x^n / Product_{k=0..n} (1 - (2*k-1)*x)^2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =65a(5) =419a(6) =3088a(7) =25557a(8) =233687a(9) =2331092a(10) =25130877a(11) =290632455a(12) =3583432896a(13) =46864388137a(14) =647273948043
External references
- oeis: A216373