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 | 13 |
| 3 | 44 |
| 4 | 776 |
| 5 | 2697 |
| 6 | 48069 |
| 7 | 167140 |
| 8 | 2979472 |
| 9 | 10359953 |
| 10 | 184679165 |
| 11 | 642149916 |
| 12 | 11447128728 |
| 13 | 39802934809 |
| 14 | 709537301941 |
| 15 | 2467139808212 |
| 16 | 43979865591584 |
| 17 | 152922865174305 |
| 18 | 2726042129376237 |
| 19 | 9478750500998668 |
| 20 | 168970632155735080 |
| 21 | 587529608196743081 |