cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A373123 Sum of all squarefree numbers from 2^(n-1) to 2^n - 1.

Table of values

n a(n)
1 1
2 5
3 18
4 63
5 218
6 891
7 3676
8 15137
9 60580
10 238672
11 953501
12 3826167
13 15308186
14 61204878
15 244709252
16 979285522
17 3917052950
18 15664274802
19 62663847447
20 250662444349
21 1002632090376
22 4010544455838
23 16042042419476
24 64168305037147
25 256675237863576

List of values

[1, 5, 18, 63, 218, 891, 3676, 15137, 60580, 238672, 953501, 3826167, 15308186, 61204878, 244709252, 979285522, 3917052950, 15664274802, 62663847447, 250662444349, 1002632090376, 4010544455838, 16042042419476, 64168305037147, 256675237863576]