a(n) = 9*a(n-1) - 3*a(n-2), with a(0)=0, a(1)=1.
A190980
a(n) = 9*a(n-1) - 3*a(n-2), with a(0)=0, a(1)=1.
Terms
- a(0) =0a(1) =1a(2) =9a(3) =78a(4) =675a(5) =5841a(6) =50544a(7) =437373a(8) =3784725a(9) =32750406a(10) =283399479a(11) =2452344093a(12) =21220898400a(13) =183631053321
External references
- oeis: A190980