A224293 Number of permutations of length n containing exactly 1 occurrence of 1234 and 1 occurrence of 1243.

0, 0, 0, 0, 0, 2, 32, 322, 2634, 19216, 130662, 848284, 5334332, 32788726, 198201268, 1183152686, 6995479542, 41055940756, 239560353258, 1391435203864, 8052418072728, 46464481278410, 267483032264168, 1536914425518970, 8817393642571330

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.

Sequence in context: A212797 A203017 A079766 * A053065 A091707 A323639

Adjacent sequences: A224290 A224291 A224292 * A224294 A224295 A224296

Keyword

nonn

Author

Brian Nakamura, Apr 03 2013

Status

approved