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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 9446031 |
| 4 | 1270004401 |
| 5 | 14214075921 |
| 6 | 1809702709101 |
| 7 | 4614899724711 |
| 8 | 6766532724546 |
| 9 | 52657436563056 |
| 10 | 98855178542676 |
| 11 | 520454948099628321 |
| 12 | 467756399278821844071 |
| 13 | 40441102744430519189191 |