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A246014
Number of permutations of [n] with every alternating run of length less than 3 in which the last alternating run has length 2.
1
0, 0, 1, 1, 4, 16, 70, 385, 2365, 16337, 125870, 1064810, 9829820, 98319221, 1058927507, 12220050571, 150421002736, 1967299266676, 27243141998506, 398221614894397, 6127294825424317, 98992456408509257, 1675478215412320154, 29646991284088234166
OFFSET
0,5
LINKS
Ira M. Gessel, Yan Zhuang, Counting permutations by alternating descents, 2014. See d(n).
CROSSREFS
Sequence in context: A280767 A091354 A326654 * A373959 A231373 A161797
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 11 2014
EXTENSIONS
More terms from Alois P. Heinz, Oct 28 2014
STATUS
approved