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 | 4 |
| 4 | 11 |
| 5 | 23 |
| 6 | 68 |
| 7 | 161 |
| 8 | 488 |
| 9 | 1249 |
| 10 | 3771 |
| 11 | 10388 |
| 12 | 35725 |
| 13 | 110449 |
| 14 | 387057 |
| 15 | 1411784 |
| 16 | 5938390 |
| 17 | 26054261 |
| 18 | 129231034 |
| 19 | 708657991 |