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 | 73 |
| 8 | 147 |
| 9 | 322 |
| 10 | 746 |
| 11 | 1758 |
| 12 | 4042 |
| 13 | 9114 |
| 14 | 20444 |
| 15 | 46217 |
| 16 | 105155 |
| 17 | 239481 |
| 18 | 544259 |
| 19 | 1234420 |
| 20 | 2798863 |
| 21 | 6350149 |
| 22 | 14416419 |
| 23 | 32732101 |
| 24 | 74301920 |
| 25 | 168633936 |
| 26 | 382715304 |
| 27 | 868630024 |
| 28 | 1971599952 |
| 29 | 4475144212 |
| 30 | 10157494573 |
| 31 | 23054646277 |