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 | 12 |
| 2 | 124 |
| 3 | 1212 |
| 4 | 11512 |
| 5 | 107544 |
| 6 | 994236 |
| 7 | 9128024 |
| 8 | 83400856 |
| 9 | 759387964 |
| 10 | 6896903064 |
| 11 | 62519804504 |
| 12 | 565914425336 |
| 13 | 5116780986152 |
| 14 | 46223426993576 |
| 15 | 417279346904792 |
| 16 | 3764890593799336 |
| 17 | 33953608251139560 |
| 18 | 306100904240342268 |