a(n) = (-5*(-1)^n + Sum_{k>=0} 2*A000108(k)*k^n/5^k)/sqrt(5), where A000108 are Catalan numbers.
A260902
a(n) = (-5*(-1)^n + Sum_{k>=0} 2*A000108(k)*k^n/5^k)/sqrt(5), where A000108 are Catalan numbers.
Terms
- a(0) =-1a(1) =3a(2) =1a(3) =27a(4) =289a(5) =4683a(6) =95761a(7) =2382747a(8) =69870529a(9) =2359997163a(10) =90239163121
External references
- oeis: A260902