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.

A201967 Expansion of 1/(1-2*x-3*x^2+x^4) in powers of x.

Table of values

n a(n)
0 1
1 2
2 7
3 20
4 60
5 178
6 529
7 1572
8 4671
9 13880
10 41244
11 122556
12 364173
13 1082134
14 3215543
15 9554932
16 28392320
17 84367302
18 250696021
19 744939016
20 2213573775
21 6577597296
22 19545219896
23 58078292664
24 172578671241
25 512814623178

List of values

[1, 2, 7, 20, 60, 178, 529, 1572, 4671, 13880, 41244, 122556, 364173, 1082134, 3215543, 9554932, 28392320, 84367302, 250696021, 744939016, 2213573775, 6577597296, 19545219896, 58078292664, 172578671241, 512814623178]