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 | 9 |
| 2 | 149 |
| 3 | 2069 |
| 4 | 28661 |
| 5 | 401253 |
| 6 | 5609569 |
| 7 | 78394141 |
| 8 | 1095695529 |
| 9 | 15314367301 |
| 10 | 214044940145 |
| 11 | 2991651891557 |
| 12 | 41813576818545 |
| 13 | 584417958076589 |
| 14 | 8168264238929833 |
| 15 | 114165795446827469 |
| 16 | 1595666897305379897 |