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

Terms

a(0) =0a(1) =0a(2) =0a(3) =6a(4) =36a(5) =130a(6) =390a(7) =1064a(8) =2744a(9) =6822a(10) =16530a(11) =39292a(12) =92004a(13) =212810a(14) =487214a(15) =1105680a(16) =2490096a(17) =5570254a(18) =12385962a(19) =27393668a(20) =60292700a(21) =132120114a(22) =288357894a(23) =627047896a(24) =1358953896a(25) =2936012150a(26) =6325009730a(27) =13589544204a(28) =29125246164a(29) =62277024922