A336599 - cp's OEIS frontend

A336599 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 are contained within the marked chord.

n	a(n)
1	1
2	5
3	1
4	33
5	9
6	3
7	279
8	87
9	39
10	15
11	2895
12	975
13	495
14	255
15	105
16	35685
17	12645
18	6885
19	4005
20	2205
21	945
22	509985
23	187425
24	106785
25	66465
26	41265
27	23625
28	10395
29	8294895
30	3133935
31	1843695
32	1198575
33	795375
34	513135
35	301455
36	135135
37	151335135
38	58437855
39	35213535
40	23601375
41	16343775
42	11263455
43	7453215
44	4459455
45	2027025

[1, 5, 1, 33, 9, 3, 279, 87, 39, 15, 2895, 975, 495, 255, 105, 35685, 12645, 6885, 4005, 2205, 945, 509985, 187425, 106785, 66465, 41265, 23625, 10395, 8294895, 3133935, 1843695, 1198575, 795375, 513135, 301455, 135135, 151335135, 58437855, 35213535, 23601375, 16343775, 11263455, 7453215, 4459455, 2027025]

cp's OEIS Frontend

A336599 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 are contained within the marked chord.

Table of values

List of values