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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 7 |
| 7 | 21 |
| 8 | 938 |
| 9 | 17797 |
| 10 | 44045 |
| 11 | 87001 |
| 12 | 454085 |
| 13 | 2217425 |
| 14 | 8156450 |
| 15 | 8475789 |
| 16 | 3293216050 |
| 17 | 11130063842 |
| 18 | 44662814795 |
| 19 | 77084972662 |