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 | 4 |
| 2 | 10 |
| 3 | 24 |
| 4 | 55 |
| 5 | 127 |
| 6 | 288 |
| 7 | 640 |
| 8 | 1408 |
| 9 | 3069 |
| 10 | 6642 |
| 11 | 14281 |
| 12 | 30544 |
| 13 | 65028 |
| 14 | 137896 |
| 15 | 291399 |
| 16 | 613885 |
| 17 | 1289715 |
| 18 | 2702909 |
| 19 | 5652038 |
| 20 | 11795170 |
| 21 | 24570079 |
| 22 | 51095155 |
| 23 | 106092067 |
| 24 | 219972452 |
| 25 | 455493427 |
| 26 | 942031726 |
| 27 | 1946056082 |
| 28 | 4015916211 |