a(n) = a(n-1)*a(n-2) + a(n-3).

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =7a(9) =23a(10) =164a(11) =3779a(12) =619779a(13) =2342145005