a(n)=9*(a(n-1)a(n-3)-a(n-2)^2)/a(n-4), a(1)=a(2)=a(3)=1, a(4)=-9.
A160569
a(n)=9*(a(n-1)a(n-3)-a(n-2)^2)/a(n-4), a(1)=a(2)=a(3)=1, a(4)=-9.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =-9a(4) =-90a(5) =-1539a(6) =51759a(7) =7026831a(8) =1349328699a(9) =-119669884380
External references
- oeis: A160569