a(n) = ((3+sqrt(2))*(5+sqrt(2))^n + (3-sqrt(2))*(5-sqrt(2))^n)/2.
A161940
a(n) = ((3+sqrt(2))*(5+sqrt(2))^n + (3-sqrt(2))*(5-sqrt(2))^n)/2.
Terms
- a(0) =3a(1) =17a(2) =101a(3) =619a(4) =3867a(5) =24433a(6) =155389a(7) =991931a(8) =6345363a(9) =40639217a(10) =260448821a(11) =1669786219a(12) =10707539307a(13) =68670310033a(14) =440429696269
External references
- oeis: A161940