Expansion of e.g.f.: exp(x*(exp(2*x) + 3)/4).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =30a(5) =146a(6) =814a(7) =5160a(8) =36412a(9) =281188a(10) =2353296a(11) =21207308a(12) =204592912a(13) =2101390032a(14) =22870108360a(15) =262698581176