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 | 40 |
| 2 | 780 |
| 3 | 9880 |
| 4 | 91390 |
| 5 | 658008 |
| 6 | 3838380 |
| 7 | 18643560 |
| 8 | 76904685 |
| 9 | 273438880 |
| 10 | 847660528 |
| 11 | 2311801440 |
| 12 | 5586853480 |
| 13 | 12033222880 |
| 14 | 23206929840 |
| 15 | 40225345056 |
| 16 | 62852101650 |
| 17 | 88732378800 |
| 18 | 113380261800 |
| 19 | 131282408400 |
| 20 | 137846528820 |
| 21 | 131282408400 |
| 22 | 113380261800 |