G.f. A(x) satisfies A(x/A(x)^2) = 1 + x ; thus A(x) = 1 + Series_Reversion(x/A(x)^2).

A120970

G.f. A(x) satisfies A(x/A(x)^2) = 1 + x ; thus A(x) = 1 + Series_Reversion(x/A(x)^2).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =9a(4) =60a(5) =504a(6) =4946a(7) =54430a(8) =655362a(9) =8496454a(10) =117311198a(11) =1711459903a(12) =26228829200a(13) =420370445830

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