A187888 - cp's OEIS frontend

A187888 Riordan matrix (1/sqrt(1-4*x),x/(1-x)).

n	a(n)
0	1
1	2
2	1
3	6
4	3
5	1
6	20
7	9
8	4
9	1
10	70
11	29
12	13
13	5
14	1
15	252
16	99
17	42
18	18
19	6
20	1
21	924
22	351
23	141
24	60
25	24
26	7
27	1
28	3432
29	1275
30	492
31	201
32	84
33	31
34	8
35	1
36	12870
37	4707
38	1767
39	693
40	285
41	115
42	39
43	9
44	1
45	48620
46	17577
47	6474
48	2460
49	978
50	400
51	154
52	48
53	10
54	1
55	184756
56	66197
57	24051
58	8934
59	3438
60	1378
61	554
62	202
63	58
64	11
65	1

[1, 2, 1, 6, 3, 1, 20, 9, 4, 1, 70, 29, 13, 5, 1, 252, 99, 42, 18, 6, 1, 924, 351, 141, 60, 24, 7, 1, 3432, 1275, 492, 201, 84, 31, 8, 1, 12870, 4707, 1767, 693, 285, 115, 39, 9, 1, 48620, 17577, 6474, 2460, 978, 400, 154, 48, 10, 1, 184756, 66197, 24051, 8934, 3438, 1378, 554, 202, 58, 11, 1]

cp's OEIS Frontend

A187888 Riordan matrix (1/sqrt(1-4*x),x/(1-x)).

Table of values

List of values