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.

A100828 Expansion of (1+2*x-2*x^3-3*x^2)/((x-1)*(x+1)*(x^2+2*x-1)).

Table of values

n a(n)
0 1
1 4
2 7
3 18
4 41
5 100
6 239
7 578
8 1393
9 3364
10 8119
11 19602
12 47321
13 114244
14 275807
15 665858
16 1607521
17 3880900
18 9369319
19 22619538
20 54608393
21 131836324
22 318281039
23 768398402
24 1855077841
25 4478554084
26 10812186007
27 26102926098
28 63018038201

List of values

[1, 4, 7, 18, 41, 100, 239, 578, 1393, 3364, 8119, 19602, 47321, 114244, 275807, 665858, 1607521, 3880900, 9369319, 22619538, 54608393, 131836324, 318281039, 768398402, 1855077841, 4478554084, 10812186007, 26102926098, 63018038201]