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 | 3 |
| 3 | 11 |
| 4 | 25 |
| 5 | 137 |
| 6 | 49 |
| 7 | 121 |
| 8 | 761 |
| 9 | 7129 |
| 10 | 7381 |
| 11 | 83711 |
| 12 | 86021 |
| 13 | 1145993 |
| 14 | 1171733 |
| 15 | 1195757 |
| 16 | 2436559 |
| 17 | 42142223 |
| 18 | 14274301 |
| 19 | 275295799 |
| 20 | 11167027 |
| 21 | 18858053 |
| 22 | 6364399 |
| 23 | 444316699 |
| 24 | 269564591 |
| 25 | 34052522467 |
| 26 | 34395742267 |
| 27 | 312536252003 |