a(n) = floor(binomial(n,9)/9).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =1a(11) =6a(12) =24a(13) =79a(14) =222a(15) =556a(16) =1271a(17) =2701a(18) =5402a(19) =10264a(20) =18662a(21) =32658a(22) =55268a(23) =90798a(24) =145278a(25) =226997a(26) =347172a(27) =520758a(28) =767433a(29) =1112778