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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 199 |
| 12 | 26071 |
| 13 | 2076337 |
| 14 | 128036597 |
| 15 | 6885473559 |
| 16 | 341688260735 |
| 17 | 16496710343843 |
| 18 | 792460210118481 |
| 19 | 38341661821182976 |
| 20 | 1882679817632403839 |
| 21 | 94308395144305086977 |
| 22 | 4834964742446401521057 |
| 23 | 254210075409129027824513 |