A216724 - cp's OEIS frontend

A216724 Triangle read by rows: T(n,k) is the number of permutations of [1..n] with k modular progressions of rise 2, distance 1 and length 3 (n >= 0, k >= 0).

n	a(n)
0	1
1	1
2	2
3	3
4	3
5	24
6	0
7	100
8	15
9	0
10	5
11	594
12	108
13	18
14	0
15	4389
16	504
17	119
18	21
19	0
20	7
21	35744
22	3520
23	960
24	64
25	32
26	0
27	325395
28	31077
29	5238
30	927
31	207
32	27
33	0
34	9
35	3288600
36	288300
37	42050
38	8800
39	900
40	100
41	50
42	0
43	36489992
44	2946141
45	409827
46	59785
47	9174
48	1518
49	319
50	33
51	0
52	11

[1, 1, 2, 3, 3, 24, 0, 100, 15, 0, 5, 594, 108, 18, 0, 4389, 504, 119, 21, 0, 7, 35744, 3520, 960, 64, 32, 0, 325395, 31077, 5238, 927, 207, 27, 0, 9, 3288600, 288300, 42050, 8800, 900, 100, 50, 0, 36489992, 2946141, 409827, 59785, 9174, 1518, 319, 33, 0, 11]

cp's OEIS Frontend

A216724 Triangle read by rows: T(n,k) is the number of permutations of [1..n] with k modular progressions of rise 2, distance 1 and length 3 (n >= 0, k >= 0).

Table of values

List of values