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 | 8 |
| 3 | 45 |
| 4 | 160 |
| 5 | 1025 |
| 6 | 936 |
| 7 | 7693 |
| 8 | 22016 |
| 9 | 123201 |
| 10 | 181000 |
| 11 | 2190221 |
| 12 | 2409408 |
| 13 | 33932665 |
| 14 | 43909880 |
| 15 | 29887229 |
| 16 | 68917248 |
| 17 | 1244818081 |
| 18 | 732937032 |
| 19 | 14699459725 |
| 20 | 17464448672 |
| 21 | 14290498033 |
| 22 | 26212519432 |
| 23 | 630291945053 |