a(n) = (2*n-1)*a(n-1) - a(n-2), a(0)=a(1)=1.
A053983
a(n) = (2*n-1)*a(n-1) - a(n-2), a(0)=a(1)=1.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =9a(4) =61a(5) =540a(6) =5879a(7) =75887a(8) =1132426a(9) =19175355a(10) =363199319a(11) =7608010344a(12) =174621038593
External references
- oeis: A053983