(Product of 3 successive Catalan numbers)/2.

A014231

(Product of 3 successive Catalan numbers)/2.

Terms

    a(0) =1a(1) =5a(2) =70a(3) =1470a(4) =38808a(5) =1189188a(6) =40489020a(7) =1491345570a(8) =58388438680

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