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 | 9 |
| 2 | 90 |
| 3 | 252 |
| 4 | 1872 |
| 5 | 4464 |
| 6 | 29250 |
| 7 | 62946 |
| 8 | 393912 |
| 9 | 809442 |
| 10 | 4945140 |
| 11 | 9899910 |
| 12 | 59366286 |
| 13 | 116999892 |
| 14 | 692936460 |
| 15 | 1349989992 |
| 16 | 7919601912 |
| 17 | 15299999856 |
| 18 | 89099130960 |
| 19 | 170999999838 |
| 20 | 989995038012 |
| 21 | 1889999872488 |
| 22 | 10889990099100 |
| 23 | 20699999999802 |
| 24 | 118799939782206 |
| 25 | 224999999981964 |