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A130531
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Column 2 of triangle A130528.
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3
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1, 3, 20, 300, 7816, 309268, 17129124, 1257440728, 117670533312, 13632858981520, 1911496421824368, 318509331241411392, 62137611331237184232, 14017177497096182047312, 3617854328162898879096264
(list; graph; refs; listen; history; internal format)
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