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 | 5 |
| 2 | 35 |
| 3 | 325 |
| 4 | 3880 |
| 5 | 57560 |
| 6 | 1030751 |
| 7 | 21763632 |
| 8 | 531604250 |
| 9 | 14789895891 |
| 10 | 462672349092 |
| 11 | 16100666809097 |
| 12 | 617634167482824 |
| 13 | 25916099832677757 |
| 14 | 1181568927574816310 |
| 15 | 58194225186901919790 |
| 16 | 3080529680131892318877 |