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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 115 |
| 5 | 1626 |
| 6 | 5370 |
| 7 | 5371 |
| 8 | 5570 |
| 9 | 5571 |
| 10 | 6170 |
| 11 | 6171 |
| 12 | 40854 |
| 13 | 373369 |
| 14 | 373469 |
| 15 | 419386 |
| 16 | 419658 |
| 17 | 419685 |
| 18 | 889609 |
| 19 | 889619 |