a(n) = 22*Sum_{i=0..n-2} 46^i*2^(n-2-i) + 2^(n-1).
A272690
a(n) = 22*Sum_{i=0..n-2} 46^i*2^(n-2-i) + 2^(n-1).
Terms
- a(0) =1a(1) =24a(2) =1060a(3) =48672a(4) =2238736a(5) =102981504a(6) =4737148480a(7) =217908828672
External references
- oeis: A272690
A272690
a(n) = 22*Sum_{i=0..n-2} 46^i*2^(n-2-i) + 2^(n-1).