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.

A245375 G.f.: Sum_{n>=0} x^n / ( (1+x)^(n+1) * (1 - 4*(n+1)*x) ).

Table of values

n a(n)
0 1
1 4
2 20
3 112
4 736
5 5632
6 49024
7 474112
8 5017600
9 57597952
10 712597504
11 9446981632
12 133474877440
13 2000265674752
14 31666683510784
15 527786775150592
16 9233419259084800
17 169106747636580352
18 3234542505882025984
19 64473076850860490752
20 1336621867385969704960
21 28769619371258703511552

List of values

[1, 4, 20, 112, 736, 5632, 49024, 474112, 5017600, 57597952, 712597504, 9446981632, 133474877440, 2000265674752, 31666683510784, 527786775150592, 9233419259084800, 169106747636580352, 3234542505882025984, 64473076850860490752, 1336621867385969704960, 28769619371258703511552]