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 | 1 |
| 3 | 7 |
| 4 | 29 |
| 5 | 81 |
| 6 | 541 |
| 7 | 3781 |
| 8 | 18537 |
| 9 | 129529 |
| 10 | 1171961 |
| 11 | 8446131 |
| 12 | 66198661 |
| 13 | 683784817 |
| 14 | 6492131829 |
| 15 | 59303102041 |
| 16 | 664191218321 |
| 17 | 7659196889841 |
| 18 | 82391350746097 |
| 19 | 991483941558079 |
| 20 | 13066764825298221 |
| 21 | 164001743446274161 |
| 22 | 2139651772557011021 |
| 23 | 30946063565684912877 |