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) |
|---|---|
| 3 | 1531 |
| 4 | 14704 |
| 5 | 132089 |
| 6 | 1165194 |
| 7 | 10254423 |
| 8 | 90693764 |
| 9 | 808627861 |
| 10 | 7276584222 |
| 11 | 66085185907 |
| 12 | 605303076120 |
| 13 | 5585690299505 |
| 14 | 51868931553714 |
| 15 | 484136128508431 |
| 16 | 4537416076416428 |
| 17 | 42662439747995981 |
| 18 | 402124615161547590 |
| 19 | 3797500862839734443 |
| 20 | 35913373920441057600 |
| 21 | 340000796575687888937 |