G.f. satisfies A(x) = 1 + x*A(x) + x^2*A(x)^7.

Terms

a(0) =1a(1) =1a(2) =2a(3) =9a(4) =44a(5) =226a(6) =1241a(7) =7093a(8) =41666a(9) =250260a(10) =1529993a(11) =9488398a(12) =59545909a(13) =377451385a(14) =2413157855a(15) =15542535697a(16) =100753850132a(17) =656856027658