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 | 3 |
| 3 | 19 |
| 4 | 198 |
| 5 | 2906 |
| 6 | 55018 |
| 7 | 1275030 |
| 8 | 34947664 |
| 9 | 1105740320 |
| 10 | 39661089864 |
| 11 | 1590232358584 |
| 12 | 70482038536880 |
| 13 | 3421732373367504 |
| 14 | 180574681050278960 |
| 15 | 10292371442183694832 |
| 16 | 630125771602386523392 |
| 17 | 41239934114630205030656 |