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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 16 |
| 7 | 38 |
| 8 | 80 |
| 9 | 180 |
| 10 | 384 |
| 11 | 840 |
| 12 | 1792 |
| 13 | 3856 |
| 14 | 8192 |
| 15 | 17440 |
| 16 | 36864 |
| 17 | 77888 |
| 18 | 163840 |
| 19 | 344192 |
| 20 | 720896 |
| 21 | 1507584 |
| 22 | 3145728 |
| 23 | 6554112 |
| 24 | 13631488 |
| 25 | 28312576 |
| 26 | 58720256 |
| 27 | 121636864 |
| 28 | 251658240 |
| 29 | 520097792 |
| 30 | 1073741824 |
| 31 | 2214600704 |
| 32 | 4563402752 |
| 33 | 9395257344 |
| 34 | 19327352832 |