A172021 - cp's OEIS frontend

A172021 Start with the triangle A171661, reverse its rows, add missing powers of 2 at beginning of each row.

n	a(n)
1	1
2	1
3	2
4	2
5	1
6	2
7	4
8	6
9	6
10	1
11	2
12	4
13	8
14	14
15	20
16	20
17	1
18	2
19	4
20	8
21	16
22	30
23	50
24	70
25	70
26	1
27	2
28	4
29	8
30	16
31	32
32	62
33	112
34	182
35	252
36	252
37	1
38	2
39	4
40	8
41	16
42	32
43	64
44	126
45	238
46	420
47	672
48	924
49	924
50	1
51	2
52	4
53	8
54	16
55	32
56	64
57	128
58	254
59	492
60	912
61	1584
62	2508
63	3432
64	3432

[1, 1, 2, 2, 1, 2, 4, 6, 6, 1, 2, 4, 8, 14, 20, 20, 1, 2, 4, 8, 16, 30, 50, 70, 70, 1, 2, 4, 8, 16, 32, 62, 112, 182, 252, 252, 1, 2, 4, 8, 16, 32, 64, 126, 238, 420, 672, 924, 924, 1, 2, 4, 8, 16, 32, 64, 128, 254, 492, 912, 1584, 2508, 3432, 3432]

cp's OEIS Frontend

A172021 Start with the triangle A171661, reverse its rows, add missing powers of 2 at beginning of each row.

Table of values

List of values