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A005287 Number of permutations of [n] with four inversions.
(Formerly M3894)
+0
3
5, 20, 49, 98, 174, 285, 440, 649, 923, 1274, 1715, 2260, 2924, 3723, 4674, 5795, 7105, 8624, 10373, 12374, 14650, 17225, 20124, 23373, 26999, 31030, 35495, 40424, 45848, 51799, 58310, 65415, 73149, 81548, 90649, 100490, 111110, 122549, 134848 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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