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Search: id:A073014
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| A073014 |
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(n!/2)*sum(k=1,n,(n+k)!/(k!)^3). |
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1
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| 1, 9, 127, 2835, 93901, 4336878, 266268402, 20961918435, 2057633544961, 246291719185578, 35300219800649134, 5967365133741366446, 1174674087014062487490, 266337973265724541242428
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