G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * x^k/(k * (1 - 3*x^k)) ).

A363546

G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * x^k/(k * (1 - 3*x^k)) ).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =22a(4) =105a(5) =497a(6) =2431a(7) =11976a(8) =59928a(9) =302816a(10) =1545660a(11) =7955132a(12) =41255625a(13) =215378364a(14) =1131134574a(15) =5972272636a(16) =31684600709a(17) =168824599282a(18) =903080385252

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