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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 18 |
| 5 | 34 |
| 6 | 90 |
| 7 | 259 |
| 8 | 988 |
| 9 | 2583 |
| 10 | 5795 |
| 11 | 37960 |
| 12 | 101268 |
| 13 | 424268 |
| 14 | 3344614 |
| 15 | 17168723 |
| 16 | 74282570 |
| 17 | 351200178 |
| 18 | 1082950218 |
| 19 | 5313193819 |
| 20 | 31439710664 |
| 21 | 317760710839 |
| 22 | 1782400663483 |