A145903 - cp's OEIS frontend

A145903 Generalized Narayana numbers for root systems of type D_n. Triangle of h-vectors of type D associahedra.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	6
8	6
9	1
10	1
11	12
12	24
13	12
14	1
15	1
16	20
17	70
18	70
19	20
20	1
21	1
22	30
23	165
24	280
25	165
26	30
27	1
28	1
29	42
30	336
31	875
32	875
33	336
34	42
35	1
36	1
37	56
38	616
39	2296
40	3500
41	2296
42	616
43	56
44	1
45	1
46	72
47	1044
48	5292
49	11466
50	11466
51	5292
52	1044
53	72
54	1

[1, 1, 1, 1, 2, 1, 1, 6, 6, 1, 1, 12, 24, 12, 1, 1, 20, 70, 70, 20, 1, 1, 30, 165, 280, 165, 30, 1, 1, 42, 336, 875, 875, 336, 42, 1, 1, 56, 616, 2296, 3500, 2296, 616, 56, 1, 1, 72, 1044, 5292, 11466, 11466, 5292, 1044, 72, 1]

cp's OEIS Frontend

A145903 Generalized Narayana numbers for root systems of type D_n. Triangle of h-vectors of type D associahedra.

Table of values

List of values