a(n) = Sum_{k=0..n} binomial(2*k, k) * binomial(2*k+1,k).
A082578
a(n) = Sum_{k=0..n} binomial(2*k, k) * binomial(2*k+1,k).
Terms
- a(0) =1a(1) =7a(2) =67a(3) =767a(4) =9587a(5) =126011a(6) =1711595a(7) =23796515a(8) =336666215a(9) =4828084575a(10) =69994481871
External references
- oeis: A082578