A309086 - cp's OEIS frontend

A309086 Irregular triangle read by rows: T(n,k) is the number of small Schröder paths of semilength n such that the area between the path and the x-axis contains k down-triangles.

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	4
6	4
7	2
8	1
9	6
10	12
11	12
12	8
13	4
14	2
15	1
16	8
17	24
18	38
19	40
20	32
21	24
22	16
23	8
24	4
25	2
26	1
27	10
28	40
29	88
30	128
31	140
32	130
33	112
34	88
35	64
36	44
37	28
38	16
39	8
40	4
41	2
42	1
43	12
44	60
45	170
46	3320
47	448
48	512
49	520
50	488
51	428
52	358
53	288
54	220
55	160
56	112
57	76
58	48
59	28
60	16
61	8
62	4
63	2

[1, 1, 1, 2, 1, 4, 4, 2, 1, 6, 12, 12, 8, 4, 2, 1, 8, 24, 38, 40, 32, 24, 16, 8, 4, 2, 1, 10, 40, 88, 128, 140, 130, 112, 88, 64, 44, 28, 16, 8, 4, 2, 1, 12, 60, 170, 3320, 448, 512, 520, 488, 428, 358, 288, 220, 160, 112, 76, 48, 28, 16, 8, 4, 2]

cp's OEIS Frontend

A309086 Irregular triangle read by rows: T(n,k) is the number of small Schröder paths of semilength n such that the area between the path and the x-axis contains k down-triangles.

Table of values

List of values