A346317 - cp's OEIS frontend

A346317 Number of permutations of [n] having two cycles of the form (c1, c2, ..., c_m) where c1 = min_{i>=1} c_i and c_j = min_{i>=j} c_i or c_j = max_{i>=j} c_i.

n	a(n)
2	1
3	3
4	11
5	40
6	148
7	560
8	2160
9	8448
10	33344
11	132352
12	527104
13	2103296
14	8401920
15	33583104
16	134279168
17	537001984
18	2147762176
19	8590524416
20	34360983552
21	137441574912
22	549761318912
23	2199034789888
24	8796117139456
25	35184422420480
26	140737593212928
27	562950171525120

[1, 3, 11, 40, 148, 560, 2160, 8448, 33344, 132352, 527104, 2103296, 8401920, 33583104, 134279168, 537001984, 2147762176, 8590524416, 34360983552, 137441574912, 549761318912, 2199034789888, 8796117139456, 35184422420480, 140737593212928, 562950171525120]

cp's OEIS Frontend

A346317 Number of permutations of [n] having two cycles of the form (c1, c2, ..., c_m) where c1 = min_{i>=1} c_i and c_j = min_{i>=j} c_i or c_j = max_{i>=j} c_i.

Table of values

List of values