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A087350
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a(n) = Sum_{k=0..n} (3*n)!/(3*k)!.
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9
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1, 7, 841, 423865, 559501801, 1527439916731, 7478345832314977, 59677199741873516461, 724719913665311983902385, 12718834484826225317486856751, 309830808050366848733979830454361, 10142621332336809160155563729753961697, 434509897877308904421064350182659719099481
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