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 | 9 |
| 2 | 87 |
| 3 | 787 |
| 4 | 6981 |
| 5 | 63183 |
| 6 | 571149 |
| 7 | 5167013 |
| 8 | 46755215 |
| 9 | 423105613 |
| 10 | 3828940359 |
| 11 | 34650738731 |
| 12 | 313579561365 |
| 13 | 2837811156791 |
| 14 | 25681442217553 |
| 15 | 232410308770677 |
| 16 | 2103252374190595 |
| 17 | 19033883010223093 |
| 18 | 172251656124086271 |