A180194 - cp's OEIS frontend

A180194 Triangle read by rows: T(n,k) is the number of permutations of [n] having k blocks of even length.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	2
6	13
7	10
8	1
9	63
10	48
11	9
12	356
13	293
14	68
15	3
16	2403
17	2036
18	557
19	44
20	18655
21	16213
22	4902
23	539
24	11
25	163988
26	145068
27	47203
28	6356
29	265
30	1608667
31	1442858
32	495710
33	76833
34	4679
35	53
36	17415725
37	15792362
38	5659377
39	971992
40	75490
41	1854
42	206202408

[1, 1, 1, 1, 4, 2, 13, 10, 1, 63, 48, 9, 356, 293, 68, 3, 2403, 2036, 557, 44, 18655, 16213, 4902, 539, 11, 163988, 145068, 47203, 6356, 265, 1608667, 1442858, 495710, 76833, 4679, 53, 17415725, 15792362, 5659377, 971992, 75490, 1854, 206202408]

cp's OEIS Frontend

A180194 Triangle read by rows: T(n,k) is the number of permutations of [n] having k blocks of even length.

Table of values

List of values