a(n) = a(n-1) + (1+a(n-2))*a(n-3) for n>1, a(1) = 1, a(n) = 0 for n<1.

A209286

a(n) = a(n-1) + (1+a(n-2))*a(n-3) for n>1, a(1) = 1, a(n) = 0 for n<1.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =9a(7) =27a(8) =77a(9) =329a(10) =2435a(11) =27845a(12) =829289a(13) =68634299a(14) =23160214349

External references