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A002620 Quarter-squares: floor(n/2)*ceiling(n/2). Equivalently, floor(n^2/4).
(Formerly M0998 N0374)
+0
134
0, 0, 1, 2, 4, 6, 9, 12, 16, 20, 25, 30, 36, 42, 49, 56, 64, 72, 81, 90, 100, 110, 121, 132, 144, 156, 169, 182, 196, 210, 225, 240, 256, 272, 289, 306, 324, 342, 361, 380, 400, 420, 441, 462, 484, 506, 529, 552, 576, 600, 625, 650, 676, 702, 729, 756, 784, 812 (list; graph; listen)
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.


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