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A055504
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n*(n-1)*(n-2)*(n-3)*(n-4)*(2*n-1)/72.
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1
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0, 0, 0, 0, 0, 15, 110, 455, 1400, 3570, 7980, 16170, 30360, 53625, 90090, 145145, 225680, 340340, 499800, 717060, 1007760, 1390515, 1887270, 2523675, 3329480, 4338950, 5591300, 7131150, 9009000, 11281725, 14013090, 17274285, 21144480
(list; graph; refs; listen; history; internal format)
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