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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 9 |
| 6 | 25 |
| 7 | 68 |
| 8 | 185 |
| 9 | 504 |
| 10 | 1379 |
| 11 | 3788 |
| 12 | 10480 |
| 13 | 29094 |
| 14 | 81193 |
| 15 | 227379 |
| 16 | 639099 |
| 17 | 1801394 |
| 18 | 5091388 |
| 19 | 14422301 |
| 20 | 40939337 |
| 21 | 116420959 |
| 22 | 331622137 |
| 23 | 946020596 |
| 24 | 2702412657 |
| 25 | 7729367873 |
| 26 | 22132856218 |
| 27 | 63444473053 |
| 28 | 182046034559 |
| 29 | 522841943138 |
| 30 | 1502920139133 |