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 | 23 |
| 3 | 431 |
| 4 | 7857 |
| 5 | 142625 |
| 6 | 2587279 |
| 7 | 46929343 |
| 8 | 851213073 |
| 9 | 15439417633 |
| 10 | 280042119887 |
| 11 | 5079439221503 |
| 12 | 92131506968913 |
| 13 | 1671092849279201 |
| 14 | 30310492056413839 |
| 15 | 549775513106272063 |
| 16 | 9971897330025100689 |
| 17 | 180871526632046468257 |
| 18 | 3280670474584477332047 |
| 19 | 59505213248435614382975 |