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 | -5 |
| 2 | -14 |
| 3 | -42 |
| 4 | -98 |
| 5 | 126 |
| 6 | 4606 |
| 7 | 50478 |
| 8 | 446782 |
| 9 | 3622206 |
| 10 | 28040446 |
| 11 | 211134798 |
| 12 | 1561328062 |
| 13 | 11403051486 |
| 14 | 82538901886 |
| 15 | 593482158318 |
| 16 | 4245770823742 |
| 17 | 30254894691966 |
| 18 | 214923605948926 |
| 19 | 1522969836817038 |
| 20 | 10770185918341822 |