a(n) = 5*a(n-1) + 20*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=9.
A154996
a(n) = 5*a(n-1) + 20*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=9.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =65a(4) =505a(5) =3825a(6) =29225a(7) =222625a(8) =1697625a(9) =12940625a(10) =98655625a(11) =752090625a(12) =5733565625a(13) =43709640625a(14) =333219515625
External references
- oeis: A154996