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 | 6 |
| 2 | 57 |
| 3 | 510 |
| 4 | 5373 |
| 5 | 53505 |
| 6 | 510403 |
| 7 | 5247173 |
| 8 | 52736107 |
| 9 | 511172800 |
| 10 | 5189628970 |
| 11 | 52334438874 |
| 12 | 511861449132 |
| 13 | 5150236044255 |
| 14 | 52074775905991 |
| 15 | 512279427101305 |
| 16 | 5118687220533539 |
| 17 | 51879201305335167 |
| 18 | 512519244788358058 |