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 | 4 |
| 2 | 25 |
| 3 | 153 |
| 4 | 1010 |
| 5 | 7122 |
| 6 | 52313 |
| 7 | 397866 |
| 8 | 3103348 |
| 9 | 24649318 |
| 10 | 198536215 |
| 11 | 1616808581 |
| 12 | 13287264748 |
| 13 | 110033428309 |
| 14 | 917072930187 |