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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..24.

Brian Nakamura, Approaches for enumerating permutations with a prescribed number of occurrences of patterns, PU. M. A. 24 (2013), 179-194

Brian Nakamura, Approaches for enumerating permutations with a prescribed number of occurrences of patterns, arXiv 1301.5080, 2013

MAPLE

Programs can be obtained from the link.

CROSSREFS

Sequence in context: A077122 A020540 A101540 * A026740 A191466 A333294

Adjacent sequences:  A224178 A224179 A224180 * A224182 A224183 A224184

KEYWORD

nonn

AUTHOR

Brian Nakamura, Apr 01 2013

STATUS

approved

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)