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A024485
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a(n) = (2/(3n-1))*C(3n,n).
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0
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-2, 3, 6, 21, 90, 429, 2184, 11628, 63954, 360525, 2072070, 12096045, 71524440, 427496076, 2578547760, 15675792072, 95951017602, 590842763469, 3657598059570, 22749427475775, 142096423925610
(list; graph; refs; listen; history; internal format)
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