A180191 - cp's OEIS frontend

A180191 Number of permutations of [n] having at least one succession. A succession of a permutation p is a position i such that p(i+1)-p(i) = 1.

n	a(n)
1	0
2	1
3	3
4	13
5	67
6	411
7	2921
8	23633
9	214551
10	2160343
11	23897269
12	288102189
13	3760013027
14	52816397219
15	794536751217
16	12744659120521
17	217140271564591
18	3916221952414383
19	74539067188152941
20	1493136645424092773
21	31400620285465593339
22	691708660911435955579

[0, 1, 3, 13, 67, 411, 2921, 23633, 214551, 2160343, 23897269, 288102189, 3760013027, 52816397219, 794536751217, 12744659120521, 217140271564591, 3916221952414383, 74539067188152941, 1493136645424092773, 31400620285465593339, 691708660911435955579]

cp's OEIS Frontend

A180191 Number of permutations of [n] having at least one succession. A succession of a permutation p is a position i such that p(i+1)-p(i) = 1.

Table of values

List of values