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 | 9 |
| 3 | 97 |
| 4 | 1297 |
| 5 | 20961 |
| 6 | 398041 |
| 7 | 8678209 |
| 8 | 213337377 |
| 9 | 5830560577 |
| 10 | 175187949481 |
| 11 | 5734893998241 |
| 12 | 203021979225649 |
| 13 | 7724154592735777 |
| 14 | 314158263983430777 |
| 15 | 13597375157683820161 |
| 16 | 623802598335834369601 |
| 17 | 30228101725367033318529 |
| 18 | 1542430410234859308052297 |