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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.

A216271 Expansion of (1-x)/((1-2x)(1-4x+x^2)).

Table of values

n a(n)
0 1
1 5
2 21
3 83
4 319
5 1209
6 4549
7 17051
8 63783
9 238337
10 890077
11 3322995
12 12403951
13 46296905
14 172791861
15 644886923
16 2406788599
17 8982333009
18 33522674509
19 125108627171
20 466912358463
21 1742541855257
22 6503257159717
23 24270490977915
24 90578715140551
25 338044386361505
26 1261598863859901

List of values

[1, 5, 21, 83, 319, 1209, 4549, 17051, 63783, 238337, 890077, 3322995, 12403951, 46296905, 172791861, 644886923, 2406788599, 8982333009, 33522674509, 125108627171, 466912358463, 1742541855257, 6503257159717, 24270490977915, 90578715140551, 338044386361505, 1261598863859901]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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