a(n) = ((5 + 2*sqrt(2))*(3 + sqrt(2))^n + (5 - 2*sqrt(2))*(3 - sqrt(2))^n)/2.

A163609

a(n) = ((5 + 2*sqrt(2))*(3 + sqrt(2))^n + (5 - 2*sqrt(2))*(3 - sqrt(2))^n)/2.

Terms

    a(0) =5a(1) =19a(2) =79a(3) =341a(4) =1493a(5) =6571a(6) =28975a(7) =127853a(8) =564293a(9) =2490787a(10) =10994671a(11) =48532517a(12) =214232405a(13) =945666811a(14) =4174374031a(15) =18426576509a(16) =81338840837a(17) =359047009459

External references