a(n) = numerator of r(n), where r(n) = (4*n+2)!/((3*n)!*2^n).

A227624

a(n) = numerator of r(n), where r(n) = (4*n+2)!/((3*n)!*2^n).

Terms

    a(0) =2a(1) =60a(2) =1260a(3) =30030a(4) =835380a(5) =26860680a(6) =984233250a(7) =40560770250

External references