A324915 - cp's OEIS frontend

A324915 a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).

n	a(n)
1	2
2	14
3	46
4	158
5	350
6	1118
7	2142
8	5982
9	12638
10	31070
11	55646
12	170334
13	285022
14	678238
15	1464670
16	3496286
17	5855582
18	16079198
19	26564958
20	70605150
21	137714014
22	288708958
23	490035550
24	1496668510
25	2536855902
26	5355428190
27	10724137310
28	25756522846
29	41862650206
30	119172061534

[2, 14, 46, 158, 350, 1118, 2142, 5982, 12638, 31070, 55646, 170334, 285022, 678238, 1464670, 3496286, 5855582, 16079198, 26564958, 70605150, 137714014, 288708958, 490035550, 1496668510, 2536855902, 5355428190, 10724137310, 25756522846, 41862650206, 119172061534]

cp's OEIS Frontend

A324915 a(n) = Sum_{k=1..n} 2^k * sigma(k), where sigma(k) = A000203(k).

Table of values

List of values