a(n) = 8*a(n-1) - 4*a(n-2), where a(0) = 1, a(1) = 4.
A090965
a(n) = 8*a(n-1) - 4*a(n-2), where a(0) = 1, a(1) = 4.
Terms
- a(0) =1a(1) =4a(2) =28a(3) =208a(4) =1552a(5) =11584a(6) =86464a(7) =645376a(8) =4817152a(9) =35955712a(10) =268377088a(11) =2003193856a(12) =14952042496a(13) =111603564544a(14) =833020346368
External references
- oeis: A090965