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A024701
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(-1 + p^2)/4, where p = p(n+1).
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2
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2, 6, 12, 30, 42, 72, 90, 132, 210, 240, 342, 420, 462, 552, 702, 870, 930, 1122, 1260, 1332, 1560, 1722, 1980, 2352, 2550, 2652, 2862, 2970, 3192, 4032, 4290, 4692, 4830, 5550, 5700, 6162, 6642, 6972, 7482, 8010, 8190, 9120, 9312, 9702, 9900, 11130, 12432, 12882, 13110
(list; graph; refs; listen; history; internal format)
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