A066767 - cp's OEIS frontend

A066767 a(n) = Sum_{k=1..n} sigma(k)*2^(n-k) where sigma(k) = A000203(k) is the sum of divisors of k.

n	a(n)
1	1
2	5
3	14
4	35
5	76
6	164
7	336
8	687
9	1387
10	2792
11	5596
12	11220
13	22454
14	44932
15	89888
16	179807
17	359632
18	719303
19	1438626
20	2877294
21	5754620
22	11509276
23	23018576
24	46037212
25	92074455
26	184148952
27	368297944
28	736595944
29	1473191918
30	2946383908

[1, 5, 14, 35, 76, 164, 336, 687, 1387, 2792, 5596, 11220, 22454, 44932, 89888, 179807, 359632, 719303, 1438626, 2877294, 5754620, 11509276, 23018576, 46037212, 92074455, 184148952, 368297944, 736595944, 1473191918, 2946383908]

cp's OEIS Frontend

A066767 a(n) = Sum_{k=1..n} sigma(k)*2^(n-k) where sigma(k) = A000203(k) is the sum of divisors of k.

Table of values

List of values