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A024401
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a(n) = [ (3rd elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+2 positive integers congruent to 2 mod 3}.
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0
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1, 3, 6, 11, 16, 22, 30, 38, 47, 58, 69, 81, 95, 109, 124, 141, 158, 176, 196, 216, 237, 260, 283, 307, 333, 359, 386, 415, 444, 474, 506, 538, 571, 606, 641, 677, 715, 753, 792, 833, 874, 916, 960
(list; graph; refs; listen; history; internal format)
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