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 | 23 |
| 2 | 483 |
| 3 | 9177 |
| 4 | 156561 |
| 5 | 2398095 |
| 6 | 33725475 |
| 7 | 465686865 |
| 8 | 6952917825 |
| 9 | 114751084455 |
| 10 | 1935277553475 |
| 11 | 32136707104425 |
| 12 | 567545846123025 |
| 13 | 11263156788858975 |
| 14 | 229832929643191875 |
| 15 | 4560180147352454625 |