a(n) = ((4+sqrt(2))*(3+sqrt(2))^n + (4-sqrt(2))*(3-sqrt(2))^n)/4.
A161944
a(n) = ((4+sqrt(2))*(3+sqrt(2))^n + (4-sqrt(2))*(3-sqrt(2))^n)/4.
Terms
- a(0) =2a(1) =7a(2) =28a(3) =119a(4) =518a(5) =2275a(6) =10024a(7) =44219a(8) =195146a(9) =861343a(10) =3802036a(11) =16782815a(12) =74082638a(13) =327016123a(14) =1443518272a(15) =6371996771a(16) =28127352722a(17) =124160138935a(18) =548069364556
External references
- oeis: A161944