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 | 4 |
| 2 | 34 |
| 3 | 36 |
| 4 | 215 |
| 5 | 258 |
| 6 | 288 |
| 7 | 1711 |
| 8 | 2785 |
| 9 | 3708 |
| 10 | 4572 |
| 11 | 4873 |
| 12 | 18986 |
| 13 | 29509 |
| 14 | 42005 |
| 15 | 45534 |
| 16 | 234272 |
| 17 | 411232 |
| 18 | 2074123 |
| 19 | 2225480 |
| 20 | 2841251 |
| 21 | 3728941 |
| 22 | 4590401 |
| 23 | 17643216 |
| 24 | 72349270 |
| 25 | 176262062 |
| 26 | 219311147 |
| 27 | 426454179 |
| 28 | 444875288 |
| 29 | 1457527586 |