a(n) = binomial coefficient C(n,8).

Terms

a(0) =1a(1) =9a(2) =45a(3) =165a(4) =495a(5) =1287a(6) =3003a(7) =6435a(8) =12870a(9) =24310a(10) =43758a(11) =75582a(12) =125970a(13) =203490a(14) =319770a(15) =490314a(16) =735471a(17) =1081575a(18) =1562275a(19) =2220075a(20) =3108105a(21) =4292145a(22) =5852925a(23) =7888725a(24) =10518300a(25) =13884156a(26) =18156204a(27) =23535820a(28) =30260340a(29) =38608020