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 | 12 |
| 2 | 160 |
| 3 | 2240 |
| 4 | 32256 |
| 5 | 473088 |
| 6 | 7028736 |
| 7 | 105431040 |
| 8 | 1593180160 |
| 9 | 24216338432 |
| 10 | 369849532416 |
| 11 | 5671026163712 |
| 12 | 87246556364800 |
| 13 | 1346089726771200 |
| 14 | 20819521107394560 |
| 15 | 322702577164615680 |
| 16 | 5011381198321090560 |
| 17 | 77954818640550297600 |
| 18 | 1214454016715941478400 |