a(n) = Sum_{k=0..floor(3*n/8)} binomial(k,3*n-8*k).

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =1a(7) =0a(8) =1a(9) =1a(10) =0a(11) =4a(12) =1a(13) =0a(14) =10a(15) =1a(16) =1a(17) =20a(18) =1a(19) =7a(20) =35a(21) =1a(22) =28a(23) =56a(24) =2a(25) =84a(26) =84a(27) =11a(28) =210a(29) =120