G.f. A(x) satisfies xA(x)^5 = B(xA(x^5)) where B(x) = x/(1-5x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =44a(5) =185a(6) =802a(7) =3553a(8) =15994a(9) =72886a(10) =335387a(11) =1555487a(12) =7261310a(13) =34083382a(14) =160730900a(15) =761039051a(16) =3616102911a(17) =17235223345a(18) =82372594183a(19) =394648349447