A290867 - cp's OEIS frontend

A290867 Irregular triangle read by rows: the number of points that are the intersections of k semicircles in the configuration A290447(n).

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	0
7	5
8	0
9	15
10	0
11	35
12	0
13	70
14	0
15	123
16	1
17	0
18	195
19	5
20	0
21	285
22	15
23	0
24	420
25	25
26	0
27	586
28	39
29	2
30	0
31	818
32	53
33	4
34	0
35	1110
36	73
37	6
38	0
39	1451
40	103
41	10
42	0
43	1846
44	142
45	18
46	0
47	2361
48	181
49	26
50	0
51	2956
52	234
53	33
54	2
55	0
56	3704
57	287
58	40
59	4
60	0
61	4567
62	348
63	49
64	8

[0, 0, 0, 0, 1, 0, 5, 0, 15, 0, 35, 0, 70, 0, 123, 1, 0, 195, 5, 0, 285, 15, 0, 420, 25, 0, 586, 39, 2, 0, 818, 53, 4, 0, 1110, 73, 6, 0, 1451, 103, 10, 0, 1846, 142, 18, 0, 2361, 181, 26, 0, 2956, 234, 33, 2, 0, 3704, 287, 40, 4, 0, 4567, 348, 49, 8]

cp's OEIS Frontend

A290867 Irregular triangle read by rows: the number of points that are the intersections of k semicircles in the configuration A290447(n).

Table of values

List of values