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 | 6 |
| 3 | 13 |
| 4 | 31 |
| 5 | 72 |
| 6 | 169 |
| 7 | 398 |
| 8 | 935 |
| 9 | 2197 |
| 10 | 5166 |
| 11 | 12147 |
| 12 | 28561 |
| 13 | 67157 |
| 14 | 157908 |
| 15 | 371293 |
| 16 | 873035 |
| 17 | 2052796 |
| 18 | 4826809 |
| 19 | 11349444 |
| 20 | 26686341 |
| 21 | 62748517 |
| 22 | 147542765 |
| 23 | 346922421 |
| 24 | 815730721 |
| 25 | 1918055941 |
| 26 | 4509991466 |
| 27 | 10604499373 |
| 28 | 24934727222 |
| 29 | 58629889046 |
| 30 | 137858491849 |