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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 37 |
| 6 | 435 |
| 7 | 6996 |
| 8 | 134428 |
| 9 | 3094785 |
| 10 | 82061325 |
| 11 | 2473950880 |
| 12 | 83606473566 |
| 13 | 3132506471139 |
| 14 | 128918727009163 |
| 15 | 5784184164416490 |
| 16 | 281105943314654760 |
| 17 | 14716271275161095761 |
| 18 | 825944690635111256697 |
| 19 | 49490362937885427672552 |