E.g.f. exp(x)*BesselI(1,2*sqrt(3)*x)/sqrt(3).

Terms

a(0) =0a(1) =1a(2) =2a(3) =12a(4) =40a(5) =185a(6) =726a(7) =3157a(8) =13112a(9) =56331a(10) =239230a(11) =1028522a(12) =4414224a(13) =19045039a(14) =82237442a(15) =356104140a(16) =1544056864a(17) =6707220443a(18) =29172892518a(19) =127058629852a(20) =554006070200