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 | 9 |
| 3 | 134 |
| 4 | 2878 |
| 5 | 76966 |
| 6 | 2376934 |
| 7 | 81330523 |
| 8 | 3005537523 |
| 9 | 117938569451 |
| 10 | 4856184495787 |
| 11 | 208008478587443 |
| 12 | 9208478072445171 |
| 13 | 419215292661445171 |
| 14 | 19548493234125829171 |
| 15 | 930767164551264230296 |
| 16 | 45133682592532326893296 |
| 17 | 2224173698690413601132296 |
| 18 | 111192059034974606204132296 |