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 | 11 |
| 3 | 29 |
| 4 | 65 |
| 5 | 137 |
| 6 | 281 |
| 7 | 569 |
| 8 | 1145 |
| 9 | 2297 |
| 10 | 4601 |
| 11 | 9209 |
| 12 | 18425 |
| 13 | 36857 |
| 14 | 73721 |
| 15 | 147449 |
| 16 | 294905 |
| 17 | 589817 |
| 18 | 1179641 |
| 19 | 2359289 |
| 20 | 4718585 |
| 21 | 9437177 |
| 22 | 18874361 |
| 23 | 37748729 |
| 24 | 75497465 |
| 25 | 150994937 |
| 26 | 301989881 |
| 27 | 603979769 |
| 28 | 1207959545 |
| 29 | 2415919097 |