Expansion of e.g.f. exp( x^2/2 + x^3/6 + x^4/24 ).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =10a(6) =40a(7) =140a(8) =630a(9) =2800a(10) =14070a(11) =73150a(12) =412720a(13) =2422420a(14) =15095080a(15) =98098000a(16) =668567900a(17) =4737532800a(18) =34971636700a(19) =267614447100