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A034857
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C(n+2,3)+2*C(n,2)+2*(n-2).
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0
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-1, 6, 18, 36, 61, 94, 136, 188, 251, 326, 414, 516, 633, 766, 916, 1084, 1271, 1478, 1706, 1956, 2229, 2526, 2848, 3196, 3571, 3974, 4406, 4868, 5361, 5886, 6444, 7036, 7663, 8326, 9026, 9764, 10541, 11358
(list; graph; refs; listen; history; internal format)
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