a(n) = a(n-2) + (n^2 - 3*n + 1)*a(n-1) with a(1)=0, a(2)=1, a(3)=1.
A121958
a(n) = a(n-2) + (n^2 - 3*n + 1)*a(n-1) with a(1)=0, a(2)=1, a(3)=1.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =6a(4) =67a(5) =1279a(6) =37158a(7) =1524757a(8) =83898793a(9) =5958339060a(10) =530376075133
External references
- oeis: A121958