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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 27 |
| 5 | 81 |
| 6 | 183 |
| 7 | 449 |
| 8 | 987 |
| 9 | 2317 |
| 10 | 5043 |
| 11 | 11265 |
| 12 | 24399 |
| 13 | 53249 |
| 14 | 114243 |
| 15 | 245853 |
| 16 | 523227 |
| 17 | 1114113 |
| 18 | 2357175 |
| 19 | 4980737 |
| 20 | 10480587 |
| 21 | 22020557 |
| 22 | 46126083 |
| 23 | 96468993 |
| 24 | 201302799 |
| 25 | 419430481 |
| 26 | 872361987 |
| 27 | 1811941645 |
| 28 | 3757981275 |
| 29 | 7784628225 |
| 30 | 16105886823 |
| 31 | 33285996545 |
| 32 | 68718951387 |
| 33 | 141733932045 |