A336598 - cp's OEIS frontend

A336598 Triangle read by rows: T(n,k) is the number of linear chord diagrams on 2n vertices with one marked chord such that exactly k of the remaining n-1 chords cross the marked chord.

n	a(n)
1	1
2	4
3	2
4	21
5	18
6	6
7	144
8	156
9	96
10	24
11	1245
12	1500
13	1260
14	600
15	120
16	13140
17	16470
18	16560
19	11160
20	4320
21	720
22	164745
23	207270
24	231210
25	194040
26	108360
27	35280
28	5040
29	2399040
30	2976120
31	3507840
32	3402000
33	2419200
34	1149120
35	322560
36	40320

[1, 4, 2, 21, 18, 6, 144, 156, 96, 24, 1245, 1500, 1260, 600, 120, 13140, 16470, 16560, 11160, 4320, 720, 164745, 207270, 231210, 194040, 108360, 35280, 5040, 2399040, 2976120, 3507840, 3402000, 2419200, 1149120, 322560, 40320]

cp's OEIS Frontend

A336598 Triangle read by rows: T(n,k) is the number of linear chord diagrams on 2n vertices with one marked chord such that exactly k of the remaining n-1 chords cross the marked chord.

Table of values

List of values