A334778 - cp's OEIS frontend

A334778 Triangle read by rows: T(n,k) is the number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly k local maxima.

n	a(n)
0	1
1	0
2	1
3	0
4	4
5	2
6	0
7	18
8	66
9	6
10	0
11	72
12	1168
13	1192
14	88
15	0
16	270
17	16220
18	61830
19	33600
20	1480
21	0
22	972
23	202416
24	2150688
25	3821760
26	1268292
27	40272
28	0
29	3402
30	2395540
31	62178928
32	272509552
33	279561086
34	62954948
35	1476944
36	0
37	11664
38	27517568
39	1629254640
40	15313310208
41	36381368048
42	24342647424
43	3963672720
44	71865728

[1, 0, 1, 0, 4, 2, 0, 18, 66, 6, 0, 72, 1168, 1192, 88, 0, 270, 16220, 61830, 33600, 1480, 0, 972, 202416, 2150688, 3821760, 1268292, 40272, 0, 3402, 2395540, 62178928, 272509552, 279561086, 62954948, 1476944, 0, 11664, 27517568, 1629254640, 15313310208, 36381368048, 24342647424, 3963672720, 71865728]

cp's OEIS Frontend

A334778 Triangle read by rows: T(n,k) is the number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly k local maxima.

Table of values

List of values