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.

A278428 Series reversion of g.f. (1/2)*x*(-1; -x)_inf, where (a; q)_inf is the q-Pochhammer symbol.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 6
6 17
7 46
8 128
9 373
10 1119
11 3405
12 10464
13 32478
14 101781
15 321642
16 1023512
17 3276326
18 10543100
19 34088806
20 110690682
21 360810160
22 1180195810
23 3872588051
24 12743937024
25 42049240694
26 139082885503
27 461072582522
28 1531697761470
29 5098246648103
30 17000237006441

List of values

[1, 1, 1, 2, 6, 17, 46, 128, 373, 1119, 3405, 10464, 32478, 101781, 321642, 1023512, 3276326, 10543100, 34088806, 110690682, 360810160, 1180195810, 3872588051, 12743937024, 42049240694, 139082885503, 461072582522, 1531697761470, 5098246648103, 17000237006441]