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 | 1 |
| 2 | 43 |
| 3 | 44 |
| 4 | 1891 |
| 5 | 1935 |
| 6 | 83161 |
| 7 | 85096 |
| 8 | 3657193 |
| 9 | 3742289 |
| 10 | 160833331 |
| 11 | 164575620 |
| 12 | 7073009371 |
| 13 | 7237584991 |
| 14 | 311051578993 |
| 15 | 318289163984 |
| 16 | 13679196466321 |
| 17 | 13997485630305 |
| 18 | 601573592939131 |
| 19 | 615571078569436 |
| 20 | 26455558892855443 |
| 21 | 27071129971424879 |