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 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 34 |
| 7 | 82 |
| 8 | 193 |
| 9 | 464 |
| 10 | 1111 |
| 11 | 2683 |
| 12 | 6482 |
| 13 | 15730 |
| 14 | 38232 |
| 15 | 93177 |
| 16 | 227458 |
| 17 | 556323 |
| 18 | 1362639 |
| 19 | 3342504 |
| 20 | 8209130 |
| 21 | 20185204 |
| 22 | 49684404 |
| 23 | 122413446 |
| 24 | 301870406 |
| 25 | 745019874 |
| 26 | 1840103575 |
| 27 | 4548008306 |
| 28 | 11248190948 |