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 | 2 |
| 2 | 1 |
| 3 | 12 |
| 4 | 13 |
| 5 | 142 |
| 6 | 155 |
| 7 | 1692 |
| 8 | 1847 |
| 9 | 20162 |
| 10 | 22009 |
| 11 | 240252 |
| 12 | 262261 |
| 13 | 2862862 |
| 14 | 3125123 |
| 15 | 34114092 |
| 16 | 37239215 |
| 17 | 406506242 |
| 18 | 443745457 |
| 19 | 4843960812 |
| 20 | 5287706269 |
| 21 | 57721023502 |
| 22 | 63008729771 |
| 23 | 687808321212 |
| 24 | 750817050983 |
| 25 | 8195978831042 |