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 | 5 |
| 3 | 40 |
| 4 | 385 |
| 5 | 4095 |
| 6 | 46376 |
| 7 | 548340 |
| 8 | 6690585 |
| 9 | 83615350 |
| 10 | 1064887395 |
| 11 | 13770292256 |
| 12 | 180320238280 |
| 13 | 2386316821325 |
| 14 | 31864803599700 |
| 15 | 428798445360120 |
| 16 | 5809228810425801 |
| 17 | 79168272296871450 |
| 18 | 1084567603590147950 |