A364317 - cp's OEIS frontend

A364317 Irregular triangle T read by rows: T(n, k) gives the number of permutations of [n] = {1, 2, ..., n} with a cycle of length m = floor(n/2) + k = A138099(n, k), for 1 <= k <= n - floor(n/2) = ceiling(n/2).

n	a(n)
1	1
2	1
3	3
4	2
5	8
6	6
7	40
8	30
9	24
10	180
11	144
12	120
13	1260
14	1008
15	840
16	720
17	8064
18	6720
19	5760
20	5040
21	72576
22	60480
23	51840
24	45360
25	40320
26	604800
27	518400
28	453600
29	403200
30	362880
31	6652800
32	5702400
33	4989600
34	4435200
35	3991680
36	3628800

[1, 1, 3, 2, 8, 6, 40, 30, 24, 180, 144, 120, 1260, 1008, 840, 720, 8064, 6720, 5760, 5040, 72576, 60480, 51840, 45360, 40320, 604800, 518400, 453600, 403200, 362880, 6652800, 5702400, 4989600, 4435200, 3991680, 3628800]

cp's OEIS Frontend

A364317 Irregular triangle T read by rows: T(n, k) gives the number of permutations of [n] = {1, 2, ..., n} with a cycle of length m = floor(n/2) + k = A138099(n, k), for 1 <= k <= n - floor(n/2) = ceiling(n/2).

Table of values

List of values