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.

A089140 Number of subsequences of {1,2,3,...,n} which are p_1-sequences.

Table of values

n a(n)
1 2
2 4
3 8
4 15
5 26
6 40
7 60
8 84
9 114
10 149
11 190
12 234
13 288
14 346
15 411
16 484
17 565
18 649
19 743
20 840
21 947
22 1063
23 1185

List of values

[2, 4, 8, 15, 26, 40, 60, 84, 114, 149, 190, 234, 288, 346, 411, 484, 565, 649, 743, 840, 947, 1063, 1185]