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 | 3 |
| 2 | 24 |
| 3 | 235 |
| 4 | 2586 |
| 5 | 30603 |
| 6 | 380359 |
| 7 | 4896753 |
| 8 | 64731747 |
| 9 | 873539236 |
| 10 | 11984536632 |
| 11 | 166661420814 |
| 12 | 2343950447112 |
| 13 | 33282048811530 |
| 14 | 476462982915993 |
| 15 | 6869620848003570 |
| 16 | 99663539644072305 |
| 17 | 1453861111238442363 |
| 18 | 21312207036239313936 |
| 19 | 313783619269186619589 |