Expansion of e.g.f. x*exp(x)*(cosh(x))^2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =28a(5) =105a(6) =366a(7) =1281a(8) =4376a(9) =14769a(10) =49210a(11) =162393a(12) =531444a(13) =1727193a(14) =5580134a(15) =17936145a(16) =57395632a(17) =182948577a(18) =581130738a(19) =1840247337a(20) =5811307340a(21) =18305618121a(22) =57531942622a(23) =180441092769a(24) =564859072968