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 | 32 |
| 3 | 292 |
| 4 | 2672 |
| 5 | 24780 |
| 6 | 232512 |
| 7 | 2201948 |
| 8 | 20997008 |
| 9 | 201314448 |
| 10 | 1938659936 |
| 11 | 18737136032 |
| 12 | 181646110192 |
| 13 | 1765522809468 |
| 14 | 17198432462368 |
| 15 | 167859941774728 |