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A025200
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a(n) = floor(floor(S3)/floor(S1)), where S3 and S1 are, respectively, the 3rd and first elementary symmetric functions of {sqrt(k), k = 1,2,...,n}.
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0
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0, 2, 5, 11, 18, 28, 42, 60, 82, 107, 140, 176, 218, 267, 324, 389, 455, 538, 622, 726, 830, 945, 1072, 1211, 1363, 1513, 1692, 1868, 2076, 2282, 2502, 2759, 3013, 3283, 3572, 3854, 4178, 4523, 4860, 5244, 5621, 6048, 6467, 6907, 7370, 7890, 8400, 8896, 9454, 10037, 10647, 11241, 11903, 12594, 13268, 13968
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