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 | 26 |
| 3 | 651 |
| 4 | 16276 |
| 5 | 406901 |
| 6 | 10172526 |
| 7 | 254313151 |
| 8 | 6357828776 |
| 9 | 158945719401 |
| 10 | 3973642985026 |
| 11 | 99341074625651 |
| 12 | 2483526865641276 |
| 13 | 62088171641031901 |
| 14 | 1552204291025797526 |
| 15 | 38805107275644938151 |
| 16 | 970127681891123453776 |
| 17 | 24253192047278086344401 |
| 18 | 606329801181952158610026 |