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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 81 |
| 4 | 456 |
| 5 | 2956 |
| 6 | 6081 |
| 7 | 37331 |
| 8 | 349831 |
| 9 | 1521706 |
| 10 | 3474831 |
| 11 | 3474831 |
| 12 | 101131081 |
| 13 | 833552956 |
| 14 | 4495662331 |
| 15 | 16702693581 |
| 16 | 16702693581 |
| 17 | 169290584206 |
| 18 | 1695169490456 |
| 19 | 16953958552956 |
| 20 | 55100931209206 |
| 21 | 436570657771706 |
| 22 | 2343919290584206 |
| 23 | 9496476663631081 |