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 | 11 |
| 1 | 40 |
| 2 | 105 |
| 3 | 242 |
| 4 | 523 |
| 5 | 1092 |
| 6 | 2237 |
| 7 | 4534 |
| 8 | 9135 |
| 9 | 18344 |
| 10 | 36769 |
| 11 | 73626 |
| 12 | 147347 |
| 13 | 294796 |
| 14 | 589701 |
| 15 | 1179518 |
| 16 | 2359159 |
| 17 | 4718448 |
| 18 | 9437033 |
| 19 | 18874210 |
| 20 | 37748571 |
| 21 | 75497300 |
| 22 | 150994765 |
| 23 | 301989702 |
| 24 | 603979583 |
| 25 | 1207959352 |
| 26 | 2415918897 |
| 27 | 4831837994 |
| 28 | 9663676195 |
| 29 | 19327352604 |