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A224291
Number of permutations of length n containing exactly 4 occurrences of 123 and 4 occurrences of 132.
0
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
1,6
MAPLE
# Programs can be obtained from author's personal website.
CROSSREFS
KEYWORD
nonn
AUTHOR
Brian Nakamura, Apr 03 2013
STATUS
approved