a(n) = Sum_{k=0..floor(5*n/9)} binomial(k,5*n-9*k).

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =0a(8) =1a(9) =1a(10) =1a(11) =6a(12) =1a(13) =21a(14) =1a(15) =56a(16) =1a(17) =126a(18) =2a(19) =252a(20) =12a(21) =462a(22) =67a(23) =792a(24) =287a(25) =1287a(26) =1002a(27) =2003a(28) =3004a(29) =3019