a(n) = (5*n)!/((n!)^2*(3*n + 1)!).
A383439
a(n) = (5*n)!/((n!)^2*(3*n + 1)!).
Terms
- a(0) =1a(1) =5a(2) =180a(3) =10010a(4) =678300a(5) =51482970a(6) =4206302100a(7) =361913666400
External references
- oeis: A383439
A383439
a(n) = (5*n)!/((n!)^2*(3*n + 1)!).