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A224292 Number of permutations of length n avoiding 1234 and containing exactly 1 occurrence of 1243. 2
0, 0, 0, 1, 10, 71, 444, 2617, 14958, 84063, 467960, 2591265, 14308722, 78911943, 435066228, 2399404345, 13242035030, 73150006271, 404525810928, 2239684086529, 12415205896794, 68905402034311, 382897019146540, 2130255439081721, 11865617032955070 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

a(n) is also the number of permutations of length n avoiding 1243 and containing exactly 1 occurrence of 1234.

LINKS

Table of n, a(n) for n=1..25.

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

MAPLE

# Programs can be obtained from author's personal website.

CROSSREFS

Cf. A006318.

Sequence in context: A136856 A016218 A026772 * A016098 A129275 A049672

Adjacent sequences:  A224289 A224290 A224291 * A224293 A224294 A224295

KEYWORD

nonn

AUTHOR

Brian Nakamura, Apr 03 2013

STATUS

approved

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Last modified October 15 05:56 EDT 2018. Contains 316202 sequences. (Running on oeis4.)