a(n) = (a(n-3)*a(n-9) + a(n-1)*a(n-11))/a(n-12) with a(0) = ... = a(11) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =2a(13) =3a(14) =4a(15) =6a(16) =9a(17) =13a(18) =19a(19) =28a(20) =41a(21) =79a(22) =163a(23) =490a(24) =972a(25) =1785a(26) =4270a(27) =9483a(28) =19251a(29) =41603