Third elementary symmetric function of 3,4,...,n+4.

Terms

a(0) =60a(1) =342a(2) =1175a(3) =3135a(4) =7140a(5) =14560a(6) =27342a(7) =48150a(8) =80520a(9) =129030a(10) =199485a(11) =299117a(12) =436800a(13) =623280a(14) =871420a(15) =1196460a(16) =1616292a(17) =2151750a(18) =2826915a(19) =3669435a(20) =4710860a(21) =5986992a(22) =7538250a(23) =9410050a(24) =11653200a(25) =14324310a(26) =17486217a(27) =21208425a(28) =25567560