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.

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

Alois P. Heinz, Table of n, a(n) for n = 3..130

Crossrefs

Column k=1 of A242783.

Sequence in context: A350810 A356642 A012857 * A249249 A034201 A099346

Adjacent sequences: A246218 A246219 A246220 * A246222 A246223 A246224

Keyword

nonn

Author

Alois P. Heinz, Aug 19 2014

Status

approved