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 | 2 |
| 3 | 4 |
| 4 | 5 |
| 5 | 6 |
| 6 | 18 |
| 7 | 36 |
| 8 | 72 |
| 9 | 89 |
| 10 | 1557 |
| 11 | 3728 |
| 12 | 4730 |
| 13 | 27642 |
| 14 | 60322 |
| 15 | 90720 |
| 16 | 104378 |
| 17 | 107183 |
| 18 | 241453 |
| 19 | 453796 |
| 20 | 679114 |
| 21 | 901262 |
| 22 | 934243 |
| 23 | 1298092 |
| 24 | 5996127 |
| 25 | 7360332 |
| 26 | 76543031 |
| 27 | 299039550 |
| 28 | 382621530 |