Denominator of binomial(6*n-2,2*n)/(2*binomial(4*n-1,2*n)).

Terms

a(0) =2a(1) =1a(2) =1a(3) =3a(4) =13a(5) =34a(6) =133a(7) =115a(8) =435a(9) =59334a(10) =2294a(11) =19721a(12) =195693a(13) =4060189a(14) =12746447a(15) =331303a(16) =25369351a(17) =4959422a(18) =11092118a(19) =28745223797a(20) =16310849170a(21) =14814154260a(22) =348379527681a(23) =263145320733a(25) =100023828627a(26) =531705615333a(27) =156537259557