A383857 - cp's OEIS frontend

A383857 Number of permutations of [n] such that precisely one rising or falling succession occurs, but without either n(n-1) or (n-1)n.

n	a(n)
1	0
2	0
3	2
4	8
5	34
6	196
7	1366
8	10928
9	98330
10	983036
11	10811134
12	129714184
13	1686103522
14	23603603540
15	354033474374
16	5664286296416
17	96289603698346
18	1733166940314028
19	32929480177913230
20	658578501071986616
21	13829959293448920434
22	304255691156335505924

[0, 0, 2, 8, 34, 196, 1366, 10928, 98330, 983036, 10811134, 129714184, 1686103522, 23603603540, 354033474374, 5664286296416, 96289603698346, 1733166940314028, 32929480177913230, 658578501071986616, 13829959293448920434, 304255691156335505924]

cp's OEIS Frontend

A383857 Number of permutations of [n] such that precisely one rising or falling succession occurs, but without either n(n-1) or (n-1)n.

Table of values

List of values