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 | 2 |
| 4 | 6 |
| 5 | 20 |
| 6 | 77 |
| 7 | 351 |
| 8 | 1923 |
| 9 | 12191 |
| 10 | 89343 |
| 11 | 739070 |
| 12 | 6799093 |
| 13 | 68520840 |
| 14 | 748504768 |
| 15 | 8788177682 |
| 16 | 110193653493 |
| 17 | 1468070974840 |
| 18 | 20694573733399 |
| 19 | 307578336213268 |
| 20 | 4805384561510138 |
| 21 | 78708210391001097 |
| 22 | 1348365584613851292 |
| 23 | 24108682771968553916 |
| 24 | 449043803118089980878 |