a(n) = ((5 + 2*sqrt(2))*(4 + sqrt(2))^n + (5 - 2*sqrt(2))*(4 - sqrt(2))^n)/2.
A163610
a(n) = ((5 + 2*sqrt(2))*(4 + sqrt(2))^n + (5 - 2*sqrt(2))*(4 - sqrt(2))^n)/2.
Terms
- a(0) =5a(1) =24a(2) =122a(3) =640a(4) =3412a(5) =18336a(6) =98920a(7) =534656a(8) =2892368a(9) =15653760a(10) =84736928a(11) =458742784a(12) =2483625280a(13) =13446603264a(14) =72802072192a(15) =394164131840
External references
- oeis: A163610