a(n) = binomial coefficient C(n,9).

Terms

a(0) =1a(1) =10a(2) =55a(3) =220a(4) =715a(5) =2002a(6) =5005a(7) =11440a(8) =24310a(9) =48620a(10) =92378a(11) =167960a(12) =293930a(13) =497420a(14) =817190a(15) =1307504a(16) =2042975a(17) =3124550a(18) =4686825a(19) =6906900a(20) =10015005a(21) =14307150a(22) =20160075a(23) =28048800a(24) =38567100a(25) =52451256a(26) =70607460a(27) =94143280a(28) =124403620a(29) =163011640