A224291 Number of permutations of length n containing exactly 4 occurrences of 123 and 4 occurrences of 132.

0, 0, 0, 0, 1, 11, 60, 270, 1084, 4028, 14144, 47577, 154740, 489728, 1514786, 4593118, 13682374, 40106060, 115824376, 329901232, 927585696, 2576685888, 7076644480, 19228648192, 51725149184

Offset: 1

Author

Brian Nakamura, Apr 03 2013

Keywords

• nonn

Links

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

Crossrefs

Cf. A000079, A001787, A001815, A046718, A001793.

Programs

Maple

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