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 | 1 |
| 3 | 4 |
| 4 | 8 |
| 5 | 62 |
| 6 | 108 |
| 7 | 1200 |
| 8 | 2048 |
| 9 | 29524 |
| 10 | 50000 |
| 11 | 885780 |
| 12 | 1492992 |
| 13 | 31374258 |
| 14 | 52706752 |
| 15 | 1281445312 |
| 16 | 2147483648 |
| 17 | 59293938248 |
| 18 | 99179645184 |
| 19 | 3065533128900 |
| 20 | 5120000000000 |