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 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 109 |
| 7 | 340 |
| 8 | 1116 |
| 9 | 3744 |
| 10 | 12981 |
| 11 | 45722 |
| 12 | 165247 |
| 13 | 603242 |
| 14 | 2242932 |
| 15 | 8422438 |
| 16 | 32040585 |
| 17 | 122800802 |
| 18 | 475937009 |