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 | 416 |
| 2 | 16621 |
| 3 | 173056 |
| 4 | 1216081 |
| 5 | 4971120 |
| 6 | 17677453 |
| 7 | 47799488 |
| 8 | 120392449 |
| 9 | 259777600 |
| 10 | 536775181 |
| 11 | 1005318336 |
| 12 | 1828277521 |
| 13 | 3107102096 |
| 14 | 5168689261 |
| 15 | 8183025280 |
| 16 | 12745702273 |
| 17 | 19117702368 |
| 18 | 28308317869 |
| 19 | 40691100800 |
| 20 | 57882676561 |
| 21 | 80386887856 |