a(n) = 8*a(n-1) + 21*a(n-2), with a(1)=1, a(2)=15.
A093117
a(n) = 8*a(n-1) + 21*a(n-2), with a(1)=1, a(2)=15.
Terms
- a(0) =1a(1) =15a(2) =141a(3) =1443a(4) =14505a(5) =146343a(6) =1475349a(7) =14875995a(8) =149990289a(9) =1512318207a(10) =15248341725a(11) =153745416147
External references
- oeis: A093117