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A246221
Number of permutations of [n] with exactly one occurrence of the consecutive step pattern given by the binary expansion of n, where 1=up and 0=down.
2
1, 3, 50, 270, 602, 5376, 139714, 1366016, 15302031, 161855232, 2600075865, 24776769024, 83295229293, 1553561635125, 93399961380678, 2499411984278178, 42789384888638364, 1138928547765375000, 15344070225505482050, 450745170646586005994, 6999343174293499456470
OFFSET
3,2
LINKS
CROSSREFS
Column k=1 of A242783.
Sequence in context: A350810 A356642 A012857 * A249249 A034201 A099346
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 19 2014
STATUS
approved