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 | 79 |
| 4 | 841 |
| 5 | 10821 |
| 6 | 162601 |
| 7 | 2777419 |
| 8 | 52960209 |
| 9 | 1112813641 |
| 10 | 25509407401 |
| 11 | 632772511911 |
| 12 | 16870674740569 |
| 13 | 480717000225229 |
| 14 | 14568646143888201 |
| 15 | 467640968478534691 |
| 16 | 15841420612530533281 |
| 17 | 564519727866573515409 |
| 18 | 21102817266052772063689 |
| 19 | 825435163723385398719871 |