a(n) = (-3*(-1)^n + Sum_{k>=0} A000108(k)*k^n/6^k)/sqrt(3), where A000108 are Catalan numbers.
A260701
a(n) = (-3*(-1)^n + Sum_{k>=0} A000108(k)*k^n/6^k)/sqrt(3), where A000108 are Catalan numbers.
Terms
- a(0) =-1a(1) =2a(2) =-1a(3) =5a(4) =20a(5) =197a(6) =2219a(7) =30620a(8) =496565a(9) =9265037a(10) =195535514a(11) =4605925535a(12) =119796721835
External references
- oeis: A260701