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 | 16 |
| 2 | 288 |
| 3 | 4896 |
| 4 | 83504 |
| 5 | 1419552 |
| 6 | 24137280 |
| 7 | 410333472 |
| 8 | 6975752256 |
| 9 | 118587788080 |
| 10 | 2015993812032 |
| 11 | 34271894799648 |
| 12 | 582622235726688 |
| 13 | 9904578007265568 |
| 14 | 168377826533765184 |
| 15 | 2862423051073925184 |
| 16 | 48661191875230982480 |
| 17 | 827240261878925204256 |
| 18 | 14063084452060314850656 |