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.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 26 |
| 4 | 73 |
| 5 | 201 |
| 6 | 545 |
| 7 | 1460 |
| 8 | 3873 |
| 9 | 10191 |
| 10 | 26633 |
| 11 | 69198 |
| 12 | 178889 |
| 13 | 460437 |
| 14 | 1180545 |
| 15 | 3016552 |
| 16 | 7684481 |
| 17 | 19522203 |
| 18 | 49473097 |
| 19 | 125093506 |
| 20 | 315654537 |
| 21 | 795016545 |
| 22 | 1998909985 |
| 23 | 5017895196 |
| 24 | 12578040097 |
| 25 | 31485713511 |
| 26 | 78716283081 |
| 27 | 196563649718 |
| 28 | 490301138569 |
| 29 | 1221726409005 |