References to A181997

G.f. satisfies: x = Sum_{n>=1} 1/A(x)^(3*n) * Product_{k=1..n} (1 - 1/A(x)^k).
1, 1, 2, 9, 46, 259, 1539, 9484, 59961, 386319, 2524940, 16687599, 111264335

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