a(n) = (A001147(n+1)^2-1)/8, where A001147(n+1) = 3*5*...*(2n+1).
A249348
a(n) = (A001147(n+1)^2-1)/8, where A001147(n+1) = 3*5*...*(2n+1).
Terms
- a(0) =0a(1) =1a(2) =28a(3) =1378a(4) =111628a(5) =13507003a(6) =2282683528a(7) =513603793828
External references
- oeis: A249348