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 | 6 |
| 3 | 33 |
| 4 | 472 |
| 5 | 3245 |
| 6 | 157896 |
| 7 | 828583 |
| 8 | 132078976 |
| 9 | 1578211209 |
| 10 | 307174074400 |
| 11 | 285351587411 |
| 12 | 1835340563252736 |
| 13 | 302881333613053 |
| 14 | 11743240652094910336 |
| 15 | 336123967242674523375 |
| 16 | 149825956013958069846016 |
| 17 | 827240617573764860177 |
| 18 | 3551697093896307129060647424 |