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 | 17 |
| 3 | 121 |
| 4 | 769 |
| 5 | 5681 |
| 6 | 39121 |
| 7 | 274345 |
| 8 | 1922945 |
| 9 | 13447009 |
| 10 | 94165777 |
| 11 | 659108825 |
| 12 | 4613711233 |
| 13 | 32296542097 |
| 14 | 226073894609 |
| 15 | 1582520918281 |
| 16 | 11077645104385 |
| 17 | 77543495432897 |
| 18 | 542804558486545 |
| 19 | 3799631689665337 |
| 20 | 26597422073425409 |