Denominator of Integrate_{x=0..n} binomial (x, n) dx.

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =45a(5) =288a(6) =140a(7) =17280a(8) =14175a(9) =89600a(10) =299376a(11) =17418240a(12) =5255250a(13) =402361344000a(14) =2501928000a(15) =98402304a(16) =488462349375