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 | 9 |
| 2 | 86 |
| 3 | 864 |
| 4 | 9016 |
| 5 | 96624 |
| 6 | 1054016 |
| 7 | 11628864 |
| 8 | 129214336 |
| 9 | 1442064384 |
| 10 | 16136869376 |
| 11 | 180866755584 |
| 12 | 2029199527936 |
| 13 | 22779718078464 |
| 14 | 255815761289216 |
| 15 | 2873425129242624 |
| 16 | 32279654468386816 |
| 17 | 362653470608523264 |