A289871 - cp's OEIS frontend

A289871 Irregular triangle read by rows T(n, k) is the number of admissible pinnacle sets with maximum element n and cardinality k.

n	a(n)
0	1
1	0
2	0
3	0
4	1
5	0
6	1
7	0
8	1
9	2
10	0
11	1
12	3
13	0
14	1
15	4
16	5
17	0
18	1
19	5
20	9
21	0
22	1
23	6
24	14
25	14
26	0
27	1
28	7
29	20
30	28
31	0
32	1
33	8
34	27
35	48
36	42
37	0
38	1
39	9
40	35
41	75
42	90
43	0
44	1
45	10
46	44
47	110
48	165
49	132
50	0
51	1
52	11
53	54
54	154
55	275
56	297
57	0
58	1
59	12
60	65
61	208
62	429
63	572
64	429
65	0
66	1
67	13
68	77
69	273
70	637
71	1001
72	1001

[1, 0, 0, 0, 1, 0, 1, 0, 1, 2, 0, 1, 3, 0, 1, 4, 5, 0, 1, 5, 9, 0, 1, 6, 14, 14, 0, 1, 7, 20, 28, 0, 1, 8, 27, 48, 42, 0, 1, 9, 35, 75, 90, 0, 1, 10, 44, 110, 165, 132, 0, 1, 11, 54, 154, 275, 297, 0, 1, 12, 65, 208, 429, 572, 429, 0, 1, 13, 77, 273, 637, 1001, 1001]

cp's OEIS Frontend

A289871 Irregular triangle read by rows T(n, k) is the number of admissible pinnacle sets with maximum element n and cardinality k.

Table of values

List of values