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A249393
The number of down-up permutations of [n] where adjacent elements differ by at least 6.
3
1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 64, 4352, 103680, 2644488, 48052224, 922764744, 15466088448, 271484691944, 4512300607488, 78169637107873, 1332149989277696, 23596090882390538
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OFFSET
0,14
LINKS
Table of n, a(n) for n=0..24.
CROSSREFS
Cf. A245377 (stride >=2), A249390, A249391, A249392, A179959 (non-alternating).
Sequence in context: A203438 A264345 A099369 * A208708 A189957 A146496
Adjacent sequences: A249390 A249391 A249392 * A249394 A249395 A249396
KEYWORD
nonn,more
AUTHOR
R. J. Mathar, Oct 27 2014
EXTENSIONS
a(19)-a(20) from Alois P. Heinz, Oct 27 2014
a(21) from Alois P. Heinz, Oct 29 2014
a(22)-a(24) from Max Alekseyev, Mar 09 2024
STATUS
approved

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Last modified November 7 03:35 EST 2024. Contains 377523 sequences.
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