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

1,6

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, A224292, A224293.

Sequence in context: A098531 A296995 A301611 * A092408 A180764 A228654

Adjacent sequences:  A224291 A224292 A224293 * A224295 A224296 A224297

KEYWORD

nonn

AUTHOR

Brian Nakamura, Apr 03 2013

STATUS

approved

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Last modified November 13 02:59 EST 2019. Contains 329085 sequences. (Running on oeis4.)