a(n) = Sum_{i=0..n} C(n,i)*C(2i,i)^2.
A248586
a(n) = Sum_{i=0..n} C(n,i)*C(2i,i)^2.
Terms
- a(0) =1a(1) =5a(2) =45a(3) =521a(4) =6733a(5) =92385a(6) =1316865a(7) =19274925a(8) =287694285a(9) =4359037985a(10) =66837293545
External references
- oeis: A248586