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A064027 a(n) = (-1)^n*Sum_{d|n}(-1)^d*d^2. +0
3
1, 3, 10, 19, 26, 30, 50, 83, 91, 78, 122, 190, 170, 150, 260, 339, 290, 273, 362, 494, 500, 366, 530, 830, 651, 510, 820, 950, 842, 780, 962, 1363, 1220, 870, 1300, 1729, 1370, 1086, 1700, 2158, 1682, 1500, 1850, 2318, 2366, 1590, 2210, 3390, 2451, 1953 (list; graph; listen)
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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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