A191831 - cp's OEIS frontend

A191831 a(n) = Sum_{i+j=n, i,j >= 1} tau(i)*sigma(j), where tau() = A000005(), sigma() = A000203().

n	a(n)
1	0
2	1
3	5
4	12
5	24
6	39
7	60
8	87
9	113
10	158
11	189
12	249
13	286
14	372
15	402
16	516
17	545
18	696
19	709
20	886
21	912
22	1125
23	1110
24	1401
25	1348
26	1674
27	1654
28	1992
29	1906
30	2390
31	2226
32	2735
33	2648
34	3141
35	2926
36	3705
37	3346
38	4069
39	3898
40	4604
41	4223
42	5282
43	4707
44	5757
45	5426
46	6326
47	5754
48	7269
49	6324
50	7669
51	7230
52	8468
53	7556
54	9456
55	8240
56	10018
57	9320
58	10748
59	9621
60	12246

[0, 1, 5, 12, 24, 39, 60, 87, 113, 158, 189, 249, 286, 372, 402, 516, 545, 696, 709, 886, 912, 1125, 1110, 1401, 1348, 1674, 1654, 1992, 1906, 2390, 2226, 2735, 2648, 3141, 2926, 3705, 3346, 4069, 3898, 4604, 4223, 5282, 4707, 5757, 5426, 6326, 5754, 7269, 6324, 7669, 7230, 8468, 7556, 9456, 8240, 10018, 9320, 10748, 9621, 12246]

cp's OEIS Frontend

A191831 a(n) = Sum_{i+j=n, i,j >= 1} tau(i)*sigma(j), where tau() = A000005(), sigma() = A000203().

Table of values

List of values