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 | 4 |
| 2 | 35 |
| 3 | 438 |
| 4 | 6873 |
| 5 | 127488 |
| 6 | 2703447 |
| 7 | 64121130 |
| 8 | 1674999009 |
| 9 | 47638235484 |
| 10 | 1461975938379 |
| 11 | 48068355965886 |
| 12 | 1683311251028265 |
| 13 | 62477888170824792 |
| 14 | 2447583053876363727 |
| 15 | 100842325515959413842 |
| 16 | 4356021203508275392833 |
| 17 | 196739133595421931988020 |
| 18 | 9268144156277932321747251 |