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A224294
Number of permutations of length n containing exactly 2 occurrences of 1234 and 2 occurrences of 1243.
0
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
1,6
MAPLE
# Programs can be obtained from author's personal website.
CROSSREFS
KEYWORD
nonn
AUTHOR
Brian Nakamura, Apr 03 2013
STATUS
approved