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 | 9 |
| 2 | 84 |
| 3 | 935 |
| 4 | 12480 |
| 5 | 196623 |
| 6 | 3591560 |
| 7 | 74847168 |
| 8 | 1755406674 |
| 9 | 45804773872 |
| 10 | 1317004696656 |
| 11 | 41386864224420 |
| 12 | 1411592788770580 |
| 13 | 51942256939923051 |
| 14 | 2051313029747633376 |
| 15 | 86548588478842559964 |
| 16 | 3885584044838123386104 |