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A034864
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a(5) = 5, a(6) = 1170, for n >= 7, a(n) = n!*(4*n^3-30*n^2+40*n+3)/24.
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0
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5, 1170, 38850, 757680, 12836880, 212133600, 3554258400, 61372080000, 1100366467200, 20555914579200, 400638734496000, 8148554878464000, 172878910364160000, 3823017399032832000
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