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 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 12 |
| 7 | 26 |
| 8 | 77 |
| 9 | 204 |
| 10 | 624 |
| 11 | 1817 |
| 12 | 5585 |
| 13 | 17007 |
| 14 | 52803 |
| 15 | 164001 |
| 16 | 514009 |
| 17 | 1615044 |
| 18 | 5100324 |
| 19 | 16152134 |
| 20 | 51324864 |