1/15840 of the volume of a primitive 3-simplex.

Terms

a(0) =13a(1) =175a(2) =490a(3) =85a(4) =308a(5) =13475a(6) =3179a(7) =9295a(8) =19760a(9) =60775a(10) =55315a(11) =225420a(12) =203665a(13) =9724a(14) =512050a(15) =568854a(16) =207740a(17) =252700a(18) =2684396a(19) =8695050a(20) =1221025a(21) =140875a(22) =3121937a(23) =311220a(24) =21390460a(25) =12289004a(26) =17331908a(27) =20074032a(28) =44144100a(29) =18055947