a(n) = (2*n-1)*a(n-1) - a(n-2) with a(0)=2, a(1)=1.
A257859
a(n) = (2*n-1)*a(n-1) - a(n-2) with a(0)=2, a(1)=1.
Terms
- a(0) =2a(1) =1a(2) =1a(3) =4a(4) =27a(5) =239a(6) =2602a(7) =33587a(8) =501203a(9) =8486864a(10) =160749213a(11) =3367246609a(12) =77285922794
External references
- oeis: A257859