a(n) = ((1+4*sqrt(2))*(3+sqrt(2))^n + (1-4*sqrt(2))*(3-sqrt(2))^n)/2.
A164299
a(n) = ((1+4*sqrt(2))*(3+sqrt(2))^n + (1-4*sqrt(2))*(3-sqrt(2))^n)/2.
Terms
- a(0) =1a(1) =11a(2) =59a(3) =277a(4) =1249a(5) =5555a(6) =24587a(7) =108637a(8) =479713a(9) =2117819a(10) =9348923a(11) =41268805a(12) =182170369a(13) =804140579a(14) =3549650891a(15) =15668921293a(16) =69165971521a(17) =305313380075
External references
- oeis: A164299