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A162254
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(2n^3 + 5n^2 + n)/2.
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1
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4, 19, 51, 106, 190, 309, 469, 676, 936, 1255, 1639, 2094, 2626, 3241, 3945, 4744, 5644, 6651, 7771, 9010, 10374, 11869, 13501, 15276, 17200, 19279, 21519, 23926, 26506, 29265, 32209, 35344, 38676, 42211, 45955, 49914, 54094, 58501, 63141
(list; graph; refs; listen; history; internal format)
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