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A135916
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(n^4 - 10*n^2 + 15*n - 6)/2.
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0
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0, 0, 15, 75, 222, 510, 1005, 1785, 2940, 4572, 6795, 9735, 13530, 18330, 24297, 31605, 40440, 51000, 63495, 78147, 95190, 114870, 137445, 163185, 192372, 225300, 262275, 303615, 349650, 400722, 457185, 519405, 587760, 662640, 744447, 833595, 930510
(list; graph; refs; listen; history; internal format)
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