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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 13 |
| 6 | 35 |
| 7 | 89 |
| 8 | 192 |
| 9 | 418 |
| 10 | 971 |
| 11 | 2336 |
| 12 | 5654 |
| 13 | 13472 |
| 14 | 31741 |
| 15 | 74468 |
| 16 | 175022 |
| 17 | 413210 |
| 18 | 977502 |
| 19 | 2311729 |
| 20 | 5460828 |
| 21 | 12889416 |
| 22 | 30420888 |
| 23 | 71817384 |
| 24 | 169592184 |
| 25 | 400517287 |
| 26 | 945825180 |
| 27 | 2233383719 |
| 28 | 5273484497 |
| 29 | 12451877435 |
| 30 | 29402388773 |
| 31 | 69428451013 |