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 | 1 |
| 2 | 4 |
| 3 | 29 |
| 4 | 336 |
| 5 | 5687 |
| 6 | 132294 |
| 7 | 4047969 |
| 8 | 157601068 |
| 9 | 7607093435 |
| 10 | 445794008034 |
| 11 | 31177310522789 |
| 12 | 2564976392355144 |
| 13 | 245223349515360543 |
| 14 | 26959450820298057694 |
| 15 | 3377267272710103354409 |
| 16 | 478240674001176206987556 |
| 17 | 76011318838172580152245187 |