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 | 10 |
| 2 | 100 |
| 3 | 450 |
| 4 | 2025 |
| 5 | 6300 |
| 6 | 19600 |
| 7 | 49000 |
| 8 | 122500 |
| 9 | 264600 |
| 10 | 571536 |
| 11 | 1111320 |
| 12 | 2160900 |
| 13 | 3880800 |
| 14 | 6969600 |
| 15 | 11761200 |
| 16 | 19847025 |
| 17 | 31853250 |
| 18 | 51122500 |
| 19 | 78728650 |
| 20 | 121242121 |
| 21 | 180360180 |
| 22 | 268304400 |
| 23 | 387550800 |
| 24 | 559795600 |
| 25 | 788351200 |
| 26 | 1110222400 |
| 27 | 1529388000 |