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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 208 |
| 5 | 3210 |
| 6 | 58056 |
| 7 | 458157 |
| 8 | 2524176 |
| 9 | 10587591 |
| 10 | 36576380 |
| 11 | 109008735 |
| 12 | 289450344 |
| 13 | 700477401 |
| 14 | 1570789892 |
| 15 | 3304892985 |
| 16 | 6586928032 |
| 17 | 12530769343 |
| 18 | 22891446252 |