a(n) = ((1 + 3*sqrt(2))*(5 + sqrt(2))^n + (1 - 3*sqrt(2))*(5 - sqrt(2))^n)/2.
A163616
a(n) = ((1 + 3*sqrt(2))*(5 + sqrt(2))^n + (1 - 3*sqrt(2))*(5 - sqrt(2))^n)/2.
Terms
- a(0) =1a(1) =11a(2) =87a(3) =617a(4) =4169a(5) =27499a(6) =179103a(7) =1158553a(8) =7466161a(9) =48014891a(10) =308427207a(11) =1979929577a(12) =12705470009a(13) =81516319819a(14) =522937387983
External references
- oeis: A163616