A224297 Number of permutations of length n containing exactly 1 occurrence of 12345 and 1 occurrence of 12354.

0, 0, 0, 0, 0, 0, 2, 56, 984, 14004, 177140, 2083560, 23374060, 254007320, 2700941710, 28293706782, 293369952474, 3020937207142, 30967869359950, 316581042622444, 3231631411510936, 32971319565628464, 336462340456201700

Offset

1,7

Links

Table of n, a(n) for n=1..23.

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. A224295, A224296.

Sequence in context: A080313 A080268 A392847 * A193476 A193475 A246001

Adjacent sequences: A224294 A224295 A224296 * A224298 A224299 A224300

Keyword

nonn

Author

Brian Nakamura, Apr 03 2013

Status

approved