a(n) = ( (5 + sqrt(7))^n - (5 - sqrt(7))^n )/(2*sqrt(7)).
A154246
a(n) = ( (5 + sqrt(7))^n - (5 - sqrt(7))^n )/(2*sqrt(7)).
Terms
- a(0) =1a(1) =10a(2) =82a(3) =640a(4) =4924a(5) =37720a(6) =288568a(7) =2206720a(8) =16872976a(9) =129008800a(10) =986374432a(11) =7541585920a(12) =57661119424a(13) =440862647680
External references
- oeis: A154246