a(n) = ((3 + sqrt(18))*(5 + sqrt(8))^n + (3 - sqrt(18))*(5 - sqrt(8))^n)/6.
A164588
a(n) = ((3 + sqrt(18))*(5 + sqrt(8))^n + (3 - sqrt(18))*(5 - sqrt(8))^n)/6.
Terms
- a(0) =1a(1) =9a(2) =73a(3) =577a(4) =4529a(5) =35481a(6) =277817a(7) =2174993a(8) =17027041a(9) =133295529a(10) =1043495593a(11) =8168931937a(12) =63949894289a(13) =500627099961
External references
- oeis: A164588