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 | 3 |
| 2 | 8 |
| 3 | 20 |
| 4 | 48 |
| 5 | 112 |
| 6 | 256 |
| 7 | 576 |
| 8 | 1280 |
| 9 | 2816 |
| 10 | 6144 |
| 11 | 13312 |
| 12 | 28672 |
| 13 | 61440 |
| 14 | 131072 |
| 15 | 278528 |
| 16 | 589824 |
| 17 | 1245184 |
| 18 | 2621440 |
| 19 | 5505024 |
| 20 | 11534336 |
| 21 | 24117248 |
| 22 | 50331648 |
| 23 | 104857600 |
| 24 | 218103808 |
| 25 | 452984832 |
| 26 | 939524096 |
| 27 | 1946157056 |
| 28 | 4026531840 |
| 29 | 8321499136 |
| 30 | 17179869184 |
| 31 | 35433480192 |