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) |
|---|---|
| 0 | 1 |
| 1 | 50 |
| 2 | 825 |
| 3 | 7700 |
| 4 | 50050 |
| 5 | 252252 |
| 6 | 1051050 |
| 7 | 3775200 |
| 8 | 12033450 |
| 9 | 34763300 |
| 10 | 92470378 |
| 11 | 229265400 |
| 12 | 534952600 |
| 13 | 1183859600 |
| 14 | 2500601400 |
| 15 | 5067885504 |
| 16 | 9898213875 |
| 17 | 18700431750 |
| 18 | 34284124875 |
| 19 | 61160599500 |
| 20 | 106419443130 |
| 21 | 180985447500 |
| 22 | 301393121250 |
| 23 | 492256440000 |
| 24 | 789661372500 |