a(n) = ((1 + 7*sqrt(2))^n - (1 - 7*sqrt(2))^n)/(14*sqrt(2)).
A125819
a(n) = ((1 + 7*sqrt(2))^n - (1 - 7*sqrt(2))^n)/(14*sqrt(2)).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =101a(4) =396a(5) =10589a(6) =59590a(7) =1146313a(8) =8072856a(9) =127338073a(10) =1037743178a(11) =14427279437a(12) =129515647140
External references
- oeis: A125819