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 | 0 |
| 2 | 8 |
| 3 | 31 |
| 4 | 86 |
| 5 | 221 |
| 6 | 581 |
| 7 | 1503 |
| 8 | 4149 |
| 9 | 11355 |
| 10 | 31985 |
| 11 | 90940 |
| 12 | 261081 |
| 13 | 756081 |
| 14 | 2208197 |
| 15 | 6483148 |
| 16 | 19132652 |
| 17 | 56714624 |
| 18 | 168806741 |
| 19 | 504209234 |