Expansion of e.g.f. exp((1 - exp(-6*x))/6).

Terms

a(0) =1a(1) =1a(2) =-5a(3) =19a(4) =1a(5) =-1103a(6) =15211a(7) =-123821a(8) =120865a(9) =19464193a(10) =-474727877a(11) =7017193075a(12) =-50549088671a(13) =-931708750607