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A128223
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a(n) = if n mod 2 = 0 then n*(n+1)/2 otherwise (n+1)^2/2-1.
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2
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0, 1, 3, 7, 10, 17, 21, 31, 36, 49, 55, 71, 78, 97, 105, 127, 136, 161, 171, 199, 210, 241, 253, 287, 300, 337, 351, 391, 406, 449, 465, 511, 528, 577, 595, 647, 666, 721, 741, 799, 820, 881, 903, 967, 990, 1057, 1081, 1151, 1176, 1249, 1275, 1351, 1378, 1457, 1485
(list; graph; refs; listen; history; internal format)
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