Binomial coefficients C(2*n-7,8).

Terms

a(0) =9a(1) =165a(2) =1287a(3) =6435a(4) =24310a(5) =75582a(6) =203490a(7) =490314a(8) =1081575a(9) =2220075a(10) =4292145a(11) =7888725a(12) =13884156a(13) =23535820a(14) =38608020a(15) =61523748a(16) =95548245a(17) =145008513a(18) =215553195a(19) =314457495a(20) =450978066a(21) =636763050a(22) =886322710a(23) =1217566350a(24) =1652411475a(25) =2217471399a(26) =2944827765a(27) =3872894697