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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 17 |
| 3 | 145 |
| 4 | 1352 |
| 5 | 12688 |
| 6 | 115958 |
| 7 | 1075397 |
| 8 | 9935791 |
| 9 | 91795006 |
| 10 | 848550447 |
| 11 | 7841290657 |
| 12 | 72469286374 |
| 13 | 669744449380 |
| 14 | 6189592846538 |
| 15 | 57202915584686 |
| 16 | 528655401099501 |
| 17 | 4885709752947038 |
| 18 | 45152583446359974 |
| 19 | 417289539653241534 |
| 20 | 3856491950197255757 |
| 21 | 35640791884109598908 |