a(n) = Sum_{k=0..n}C(n,k)^2*C(2k,k)/(2k-1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
A246065
a(n) = Sum_{k=0..n}C(n,k)^2*C(2k,k)/(2k-1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
Terms
- a(0) =-1a(1) =1a(2) =9a(3) =39a(4) =177a(5) =927a(6) =5463a(7) =34857a(8) =234657a(9) =1641471a(10) =11820135a(11) =87080265a(12) =653499135a(13) =4979882385a(14) =38441107305a(15) =300027646647
External references
- oeis: A246065