a(n) = ((1 + 7*sqrt(2))^n + (1 - 7*sqrt(2))^n)/2.
A125820
a(n) = ((1 + 7*sqrt(2))^n + (1 - 7*sqrt(2))^n)/2.
Terms
- a(0) =1a(1) =1a(2) =99a(3) =295a(4) =10193a(5) =49001a(6) =1086723a(7) =6926543a(8) =119265217a(9) =910405105a(10) =13389536259a(11) =115088367703
External references
- oeis: A125820