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 | 6 |
| 1 | 4 |
| 2 | 16 |
| 3 | 34 |
| 4 | 96 |
| 5 | 244 |
| 6 | 646 |
| 7 | 1684 |
| 8 | 4416 |
| 9 | 11554 |
| 10 | 30256 |
| 11 | 79204 |
| 12 | 207366 |
| 13 | 542884 |
| 14 | 1421296 |
| 15 | 3720994 |
| 16 | 9741696 |
| 17 | 25504084 |
| 18 | 66770566 |
| 19 | 174807604 |
| 20 | 457652256 |
| 21 | 1198149154 |
| 22 | 3136795216 |
| 23 | 8212236484 |
| 24 | 21499914246 |
| 25 | 56287506244 |
| 26 | 147362604496 |
| 27 | 385800307234 |
| 28 | 1010038317216 |