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 | 16 |
| 3 | 30 |
| 4 | 64 |
| 5 | 195 |
| 6 | 625 |
| 7 | 2580 |
| 8 | 8836 |
| 9 | 34903 |
| 10 | 148996 |
| 11 | 629880 |
| 12 | 2722500 |
| 13 | 12034106 |
| 14 | 53304601 |
| 15 | 238715100 |
| 16 | 1069617025 |
| 17 | 4811385635 |
| 18 | 21685802121 |
| 19 | 97859055714 |
| 20 | 441832737025 |
| 21 | 1996456911552 |
| 22 | 9023583429184 |
| 23 | 40798463142960 |
| 24 | 184481127958689 |