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 | 13 |
| 2 | 3 |
| 3 | 41 |
| 4 | 509 |
| 5 | 2 |
| 6 | 89 |
| 7 | 1122659 |
| 8 | 19099919 |
| 9 | 85864769 |
| 10 | 26089808579 |
| 11 | 665043081119 |
| 12 | 554688278429 |
| 13 | 4090932431513069 |
| 14 | 95405042230542329 |
| 15 | 90616211958465842219 |
| 16 | 810433818265726529159 |