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A224181
Number of permutations of length n containing exactly 2 occurrences of 1243.
0
0, 0, 0, 0, 4, 56, 543, 4600, 36691, 284370, 2174352, 16533360, 125572259, 955035260, 7283925999, 55755366698, 428521485446, 3307587704256, 25640569219948, 199621168997272, 1560661865377319, 12251246212162453, 96551383368363609, 763795078132240253
OFFSET
1,5
LINKS
Andrew R. Conway and Anthony J. Guttmann, Counting occurrences of patterns in permutations, arXiv:2306.12682 [math.CO], 2023. See p. 21.
MAPLE
Programs can be obtained from the arXiv 1301.5080 link.
CROSSREFS
Sequence in context: A020540 A101540 A358882 * A026740 A191466 A333294
KEYWORD
nonn
AUTHOR
Brian Nakamura, Apr 01 2013
STATUS
approved