E.g.f. satisfies A(x) = exp(x*A(x^6/6!)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =8a(8) =57a(9) =253a(10) =841a(11) =2311a(12) =5545a(13) =18019a(14) =192193a(15) =1936936a(16) =13533521a(17) =71607537a(18) =308979217a(19) =1195354525a(20) =8070684721a(21) =113661781381