A319133 - cp's OEIS frontend

A319133 a(1) = a(2) = 1; for n > 2, a(n+2) = Sum_{d|n} tau(n/d)*a(d), where tau = number of divisors (A000005).

n	a(n)
1	1
2	1
3	1
4	3
5	3
6	8
7	5
8	16
9	7
10	29
11	12
12	41
13	14
14	76
15	16
16	92
17	28
18	142
19	30
20	185
21	32
22	268
23	48
24	298
25	50
26	466
27	59
28	500
29	80
30	683
31	82
32	817
33	84
34	1072
35	114
36	1134
37	134
38	1583
39	136
40	1649
41	170
42	2176
43	172
44	2444
45	174
46	3032
47	239
48	3134
49	241
50	4174
51	254
52	4353
53	316
54	5343
55	318
56	5815
57	352
58	7121
59	418
60	7287
61	420
62	9357
63	422
64	9527
65	525

[1, 1, 1, 3, 3, 8, 5, 16, 7, 29, 12, 41, 14, 76, 16, 92, 28, 142, 30, 185, 32, 268, 48, 298, 50, 466, 59, 500, 80, 683, 82, 817, 84, 1072, 114, 1134, 134, 1583, 136, 1649, 170, 2176, 172, 2444, 174, 3032, 239, 3134, 241, 4174, 254, 4353, 316, 5343, 318, 5815, 352, 7121, 418, 7287, 420, 9357, 422, 9527, 525]

cp's OEIS Frontend

A319133 a(1) = a(2) = 1; for n > 2, a(n+2) = Sum_{d|n} tau(n/d)*a(d), where tau = number of divisors (A000005).

Table of values

List of values