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 | 6 |
| 3 | 14 |
| 4 | 32 |
| 5 | 82 |
| 6 | 196 |
| 7 | 464 |
| 8 | 1142 |
| 9 | 2746 |
| 10 | 6576 |
| 11 | 15976 |
| 12 | 38484 |
| 13 | 92544 |
| 14 | 223790 |
| 15 | 539402 |
| 16 | 1299184 |
| 17 | 3136178 |
| 18 | 7560760 |
| 19 | 18222032 |
| 20 | 43956888 |
| 21 | 105980632 |
| 22 | 255487040 |
| 23 | 616137680 |
| 24 | 1485562228 |
| 25 | 3581617536 |
| 26 | 8636505982 |
| 27 | 20823634954 |
| 28 | 50206996848 |