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

Terms

a(0) =1a(1) =2a(2) =7a(3) =30a(4) =157a(5) =970a(6) =6931a(7) =56294a(8) =512569a(9) =5173074a(10) =57330271a(11) =692227822a(12) =9045871957a(13) =127205130650