a(n) = numerator of r(n) = 2*(3*n+2)!/((2*n)!*2^n), n>=0.

A227528

a(n) = numerator of r(n) = 2*(3*n+2)!/((2*n)!*2^n), n>=0.

Terms

    a(0) =4a(1) =60a(2) =840a(3) =13860a(4) =270270a(5) =6126120a(6) =158722200a(7) =4633467300a(8) =150587687250

External references