A275327 - cp's OEIS frontend

A275327 Triangle read by rows, Riordan array (1, (2+(x-1)/(2x^2)(1-sqrt(1-4x^2)))/ sqrt(1-4x^2)).

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	3
8	2
9	1
10	0
11	2
12	7
13	3
14	1
15	0
16	10
17	10
18	12
19	4
20	1
21	0
22	5
23	33
24	25
25	18
26	5
27	1
28	0
29	35
30	42
31	78
32	48
33	25
34	6
35	1
36	0
37	14
38	144
39	144
40	155
41	80
42	33
43	7
44	1
45	0
46	126
47	168
48	420
49	356
50	275
51	122
52	42
53	8
54	1
55	0
56	42
57	610
58	723
59	1018
60	736
61	450
62	175
63	52
64	9
65	1

[1, 0, 1, 0, 1, 1, 0, 3, 2, 1, 0, 2, 7, 3, 1, 0, 10, 10, 12, 4, 1, 0, 5, 33, 25, 18, 5, 1, 0, 35, 42, 78, 48, 25, 6, 1, 0, 14, 144, 144, 155, 80, 33, 7, 1, 0, 126, 168, 420, 356, 275, 122, 42, 8, 1, 0, 42, 610, 723, 1018, 736, 450, 175, 52, 9, 1]

cp's OEIS Frontend

A275327 Triangle read by rows, Riordan array (1, (2+(x-1)/(2x^2)(1-sqrt(1-4x^2)))/ sqrt(1-4x^2)).

Table of values

List of values

cp's OEIS Frontend

A275327 Triangle read by rows, Riordan array (1, (2+(x-1)/(2*x^2)*(1-sqrt(1-4*x^2)))/ sqrt(1-4*x^2)).

Table of values

List of values

A275327 Triangle read by rows, Riordan array (1, (2+(x-1)/(2x^2)(1-sqrt(1-4x^2)))/ sqrt(1-4x^2)).