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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 7 |
| 6 | 5 |
| 7 | 85 |
| 8 | 335 |
| 9 | 1135 |
| 10 | 15245 |
| 11 | 13475 |
| 12 | 717575 |
| 13 | 4256825 |
| 14 | 29782325 |
| 15 | 525045275 |
| 16 | 243258625 |
| 17 | 56809006625 |
| 18 | 415670267875 |
| 19 | 5068080417875 |
| 20 | 104229929847625 |
| 21 | 60861649495625 |
| 22 | 20784245979986875 |
| 23 | 169274937975443125 |
| 24 | 3318579283890780625 |
| 25 | 75028912866554839375 |