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 | 7 |
| 3 | 24 |
| 4 | 103 |
| 5 | 416 |
| 6 | 1998 |
| 7 | 8822 |
| 8 | 45661 |
| 9 | 213674 |
| 10 | 1167797 |
| 11 | 5694690 |
| 12 | 32445914 |
| 13 | 163151262 |
| 14 | 960580840 |
| 15 | 4945645808 |
| 16 | 29899013071 |
| 17 | 156834641076 |
| 18 | 968947169139 |