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 | 0 |
| 2 | 100 |
| 3 | 1000 |
| 4 | 10000 |
| 5 | 100000 |
| 6 | 1000000 |
| 7 | 10000000 |
| 8 | 100000000 |
| 9 | 1000000000 |
| 10 | 0 |
| 11 | 22187726197 |
| 12 | 9322172416 |
| 13 | 74188586872 |
| 14 | 207144033280 |
| 15 | 88222656250 |
| 16 | 1041257005056 |
| 17 | 654556028253 |
| 18 | 1391503283200 |
| 19 | 4084075030363 |
| 20 | 0 |
| 21 | 2770357806334 |
| 22 | 15498434643968 |
| 23 | 29882775483895 |
| 24 | 5484153143296 |