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A249392 The number of down-up permutations of [n] where adjacent elements differ by at least 5. 3
1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 32, 1088, 17280, 293832, 4004352, 57687080, 773838336, 10900027949, 151388845568, 2200665880514, 32321771402240, 495575856116168, 7760560549644288, 126552637539515688 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,12
LINKS
CROSSREFS
Cf. A245377 (at least 2), A249390 (at least 3), A249391 (at least 4), A249393 (at least 6), A179958 (non-alternating)
Sequence in context: A158685 A265021 A159360 * A114933 A038097 A208267
KEYWORD
nonn,more
AUTHOR
R. J. Mathar, Oct 27 2014
EXTENSIONS
a(17)-a(21) from Alois P. Heinz, Oct 27 2014
a(22)-a(24) from Max Alekseyev, Feb 24 2024
STATUS
approved

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Last modified June 15 11:51 EDT 2024. Contains 373407 sequences. (Running on oeis4.)