A224294 Number of permutations of length n containing exactly 2 occurrences of 1234 and 2 occurrences of 1243.
0, 0, 0, 0, 0, 2, 34, 382, 3518, 28708, 216098, 1536960, 10488708, 69393216, 448301130, 2842611306, 17758399872, 109613418746, 669950441982, 4061411038376, 24453911859134, 146393798673526, 872121958672162, 5173931524573894, 30584965562156650
Offset: 1
Keywords
Links
- B. Nakamura, Approaches for enumerating permutations with a prescribed number of occurrences of patterns, arXiv 1301.5080, 2013.
Programs
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Maple
# Programs can be obtained from author's personal website.