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 | 9 |
| 3 | 163 |
| 4 | 6193 |
| 5 | 375001 |
| 6 | 33602521 |
| 7 | 4150656721 |
| 8 | 676462516801 |
| 9 | 140587148681281 |
| 10 | 36288005670120961 |
| 11 | 11388728893445164801 |
| 12 | 4270826391670469473921 |
| 13 | 1886009588552176549862401 |
| 14 | 968725766890781857146309121 |
| 15 | 572622616354852243874626732801 |