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 | 2 |
| 2 | 12 |
| 3 | 122 |
| 4 | 1800 |
| 5 | 35002 |
| 6 | 848236 |
| 7 | 24664362 |
| 8 | 837602352 |
| 9 | 32558200370 |
| 10 | 1426118691924 |
| 11 | 69522324440098 |
| 12 | 3733960438696648 |
| 13 | 219101400537409002 |
| 14 | 13946923555466389884 |
| 15 | 957297896801470079258 |
| 16 | 70483467144263313405024 |
| 17 | 5541471459106022647303522 |