A246221 - cp's OEIS frontend

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.

n	a(n)
3	1
4	3
5	50
6	270
7	602
8	5376
9	139714
10	1366016
11	15302031
12	161855232
13	2600075865
14	24776769024
15	83295229293
16	1553561635125
17	93399961380678
18	2499411984278178
19	42789384888638364
20	1138928547765375000
21	15344070225505482050
22	450745170646586005994
23	6999343174293499456470

[1, 3, 50, 270, 602, 5376, 139714, 1366016, 15302031, 161855232, 2600075865, 24776769024, 83295229293, 1553561635125, 93399961380678, 2499411984278178, 42789384888638364, 1138928547765375000, 15344070225505482050, 450745170646586005994, 6999343174293499456470]

cp's OEIS Frontend

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.

Table of values

List of values