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A080260
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a(n)=1+(1/12)(n*(n-1)*(n+3)*(4-n)).
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0
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1, 3, 6, 7, 1, -19, -62, -139, -263, -449, -714, -1077, -1559, -2183, -2974, -3959, -5167, -6629, -8378, -10449, -12879, -15707, -18974, -22723, -26999, -31849, -37322, -43469, -50343, -57999, -66494, -75887, -86239, -97613, -110074, -123689, -138527, -154659, -172158, -191099, -211559
(list; graph; refs; listen; history; internal format)
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