A224294 Number of permutations of length n containing exactly 2 occurrences of 1234 and 2 occurrences of 1243.

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

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: A356342 A296995 A301611 * A092408 A180764 A228654

Adjacent sequences: A224291 A224292 A224293 * A224295 A224296 A224297

Keyword

nonn

Author

Brian Nakamura, Apr 03 2013

Status

approved