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 | 50 |
| 4 | 630 |
| 5 | 9285 |
| 6 | 151652 |
| 7 | 2658131 |
| 8 | 49061128 |
| 9 | 942055396 |
| 10 | 18662965393 |
| 11 | 379195887105 |
| 12 | 7867076520341 |
| 13 | 166102773740621 |
| 14 | 3559787677138284 |
| 15 | 77278541685154409 |
| 16 | 1696519572528877274 |