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 | 2 |
| 2 | 8 |
| 3 | 16 |
| 4 | 136 |
| 5 | 272 |
| 6 | 3968 |
| 7 | 7936 |
| 8 | 176896 |
| 9 | 353792 |
| 10 | 11184128 |
| 11 | 22368256 |
| 12 | 951878656 |
| 13 | 1903757312 |
| 14 | 104932671488 |
| 15 | 209865342976 |
| 16 | 14544442556416 |
| 17 | 29088885112832 |
| 18 | 2475749026562048 |
| 19 | 4951498053124096 |
| 20 | 507711943253426176 |
| 21 | 1015423886506852352 |
| 22 | 123460740095103991808 |