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 | 3 |
| 3 | 7 |
| 4 | 21 |
| 5 | 56 |
| 6 | 63 |
| 7 | 168 |
| 8 | 252 |
| 9 | 504 |
| 10 | 819 |
| 11 | 2184 |
| 12 | 3276 |
| 13 | 6552 |
| 14 | 15561 |
| 15 | 32760 |
| 16 | 62244 |
| 17 | 124488 |
| 18 | 482391 |
| 19 | 622440 |
| 20 | 1929564 |
| 21 | 3859128 |
| 22 | 17848467 |
| 23 | 19295640 |
| 24 | 71393868 |
| 25 | 142787736 |
| 26 | 713938680 |
| 27 | 3069936324 |
| 28 | 6139872648 |
| 29 | 30699363240 |
| 30 | 187266115764 |
| 31 | 337692995640 |
| 32 | 374532231528 |