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 | 23 |
| 2 | 1681 |
| 3 | 257543 |
| 4 | 67637281 |
| 5 | 27138236663 |
| 6 | 15442193173681 |
| 7 | 11828536957233383 |
| 8 | 11735529528739490881 |
| 9 | 14639678925928297567703 |
| 10 | 22427641105413135505628881 |
| 11 | 41393949926819051111431239623 |
| 12 | 90592214447886493688036507587681 |
| 13 | 231969423543894989257690172433129143 |