G.f. satisfies: A(x) = 1 + x/A(-x*A(x)^6)^3.

Terms

a(0) =1a(1) =1a(2) =3a(3) =15a(4) =82a(5) =549a(6) =3957a(7) =31423a(8) =262905a(9) =2309655a(10) =20954053a(11) =195219912a(12) =1855139472a(13) =17913275558a(14) =175183126884