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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 17 |
| 5 | 113 |
| 6 | 673 |
| 7 | 5669 |
| 8 | 48033 |
| 9 | 494081 |
| 10 | 5387009 |
| 11 | 65835109 |
| 12 | 871869745 |
| 13 | 12394430129 |
| 14 | 192177458593 |
| 15 | 3124415825605 |
| 16 | 55316788832065 |
| 17 | 1014225530028161 |
| 18 | 20139680768683777 |
| 19 | 411568350375102789 |