a(n) = Sum_{k=0..floor(2*n/5)} binomial(k,2*n-5*k).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =1a(6) =1a(7) =0a(8) =3a(9) =1a(10) =1a(11) =6a(12) =1a(13) =5a(14) =10a(15) =2a(16) =15a(17) =15a(18) =8a(19) =35a(20) =22a(21) =29a(22) =70a(23) =37a(24) =85a(25) =127a(26) =81a(27) =211a(28) =221a(29) =210