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

Terms

a(0) =1a(1) =1a(2) =2a(3) =8a(4) =35a(5) =181a(6) =1042a(7) =6301a(8) =39435a(9) =249744a(10) =1585386a(11) =10027385a(12) =62696192a(13) =385398251a(14) =2322152120a(15) =13727653882a(16) =80274175978a(17) =472701550856