Numerator of n*Product_{j=1..n-1} ((3*j + 1)/(3*j + 2)).

Terms

a(0) =1a(1) =8a(2) =21a(3) =28a(4) =65a(5) =624a(6) =3458a(7) =7904a(8) =1710a(9) =53200a(10) =226765a(11) =3534a(12) =14911a(13) =160580a(14) =3699075a(15) =3945680a(16) =41084393a(17) =1131029172a(18) =85276009a(19) =44882110a(20) =185464461a(21) =239133664a(22) =4187556548a(23) =61174739136a(24) =62862555700a(25) =709808057504a(28) =90908444753a(29) =752345749680