a(n) = binomial(n, 9) + 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =2a(10) =11a(11) =56a(12) =221a(13) =716a(14) =2003a(15) =5006a(16) =11441a(17) =24311a(18) =48621a(19) =92379a(20) =167961a(21) =293931a(22) =497421a(23) =817191a(24) =1307505a(25) =2042976a(26) =3124551a(27) =4686826a(28) =6906901a(29) =10015006