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 | 6 |
| 3 | 9 |
| 4 | 30 |
| 5 | 33 |
| 6 | 203 |
| 7 | 270 |
| 8 | 220 |
| 9 | 1476 |
| 10 | 1368 |
| 11 | 2638 |
| 12 | 10561 |
| 13 | 10726 |
| 14 | 18926 |
| 15 | 87984 |
| 16 | 86693 |
| 17 | 101294 |
| 18 | 170447 |
| 19 | 734638 |
| 20 | 749502 |
| 21 | 1503095 |
| 22 | 6475615 |
| 23 | 3131428 |
| 24 | 7364000 |
| 25 | 6504583 |
| 26 | 27508889 |
| 27 | 56295291 |
| 28 | 66084700 |
| 29 | 98097954 |