Expansion of e.g.f. exp(x)/(1-x-x^2).

Terms

a(0) =1a(1) =2a(2) =7a(3) =34a(4) =221a(5) =1786a(6) =17347a(7) =196442a(8) =2542969a(9) =37030546a(10) =599172671a(11) =10664259442a(12) =207061905877