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A093303
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a(n) = (a(n-1)*(2n-1)) + 2n with a(0)=0.
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0
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0, 2, 10, 56, 400, 3610, 39722, 516400, 7746016, 131682290, 2501963530, 52541234152, 1208448385520, 30211209638026, 815702660226730, 23655377146575200, 733316691543831232, 24199450820946430690
(list; graph; refs; listen; history; internal format)
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