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 | 2 |
| 1 | 7 |
| 2 | 19 |
| 3 | 127 |
| 4 | 5419 |
| 5 | 1009 |
| 6 | 9181 |
| 7 | 1423 |
| 8 | 96493 |
| 9 | 163350799 |
| 10 | 25249969 |
| 11 | 212520319916977 |
| 12 | 784949209969 |
| 13 | 145542538757017 |
| 14 | 147660435988297 |
| 15 | 2508855873622663 |
| 16 | 3565137918692593 |
| 17 | 6521735641 |
| 18 | 11273204227 |
| 19 | 16141059763 |
| 20 | 125679599753438821 |
| 21 | 240780337980146570229319 |
| 22 | 7282590063606707136764017 |