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 | 11 |
| 2 | 71 |
| 3 | 1043 |
| 4 | 4273 |
| 5 | 15403 |
| 6 | 151049 |
| 7 | 3196873 |
| 8 | 9065053 |
| 9 | 219181447 |
| 10 | 80314181 |
| 11 | 15236362807 |
| 12 | 9881224121 |
| 13 | 3255762225533 |
| 14 | 51047003351891 |
| 15 | 334353686524303 |
| 16 | 713211624791333 |
| 17 | 516702875135479 |
| 18 | 466605840054517979 |