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 | 1 |
| 2 | 2 |
| 3 | 61 |
| 4 | 44 |
| 5 | 989 |
| 6 | 6346 |
| 7 | 51197 |
| 8 | 36056 |
| 9 | 4127401 |
| 10 | 2057402 |
| 11 | 189721879 |
| 12 | 236723324 |
| 13 | 1422382919 |
| 14 | 20600649518 |
| 15 | 10227626700773 |
| 16 | 638723926928 |
| 17 | 1278290544991 |
| 18 | 23635180313246 |
| 19 | 94585786464329 |
| 20 | 969106771716436 |
| 21 | 83372817133541471 |