G.f. A(x) satisfies: A(x)^7 = A(x^7) + 7*x.

Terms

a(0) =1a(1) =1a(2) =-3a(3) =13a(4) =-65a(5) =351a(6) =-1989a(7) =11650a(8) =-69900a(9) =427167a(10) =-2648438a(11) =16612947a(12) =-105215448a(13) =671760933a(14) =-4318468134a(15) =27926126553a(16) =-181520036178