a(n) = floor(binomial(n,8)/8).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =1a(10) =5a(11) =20a(12) =61a(13) =160a(14) =375a(15) =804a(16) =1608a(17) =3038a(18) =5469a(19) =9447a(20) =15746a(21) =25436a(22) =39971a(23) =61289a(24) =91933a(25) =135196a(26) =195284a(27) =277509a(28) =388513a(29) =536518