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 | 1 |
| 2 | 241 |
| 3 | 6481 |
| 4 | 65281 |
| 5 | 390001 |
| 6 | 1678321 |
| 7 | 5762401 |
| 8 | 16773121 |
| 9 | 43040161 |
| 10 | 99990001 |
| 11 | 214344241 |
| 12 | 429960961 |
| 13 | 815702161 |
| 14 | 1475750641 |
| 15 | 2562840001 |
| 16 | 4294901761 |
| 17 | 6975673921 |
| 18 | 11019855601 |
| 19 | 16983432721 |
| 20 | 25599840001 |
| 21 | 37822664881 |
| 22 | 54875639281 |
| 23 | 78310705441 |
| 24 | 110074982401 |