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 | 7 |
| 3 | 103 |
| 4 | 2365 |
| 5 | 74305 |
| 6 | 2970415 |
| 7 | 144324775 |
| 8 | 8259853525 |
| 9 | 544284565825 |
| 10 | 40589062689175 |
| 11 | 3379489549611175 |
| 12 | 310764664533047725 |
| 13 | 31280478682100673025 |
| 14 | 3420865044191897677375 |
| 15 | 403897481132212723030375 |
| 16 | 51205807000808636432381125 |
| 17 | 6937963969329514181526090625 |