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 | 21 |
| 2 | 184 |
| 3 | 5364 |
| 4 | 153562 |
| 5 | 4588174 |
| 6 | 136134243 |
| 7 | 4041385884 |
| 8 | 119990644449 |
| 9 | 3562337669985 |
| 10 | 105762437152368 |
| 11 | 3139973158165990 |
| 12 | 93222494384394215 |
| 13 | 2767677519549496896 |
| 14 | 82169423941902553632 |
| 15 | 2439523490954376368513 |