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) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 6 |
| 8 | 13 |
| 9 | 25 |
| 10 | 53 |
| 11 | 106 |
| 12 | 224 |
| 13 | 475 |
| 14 | 1037 |
| 15 | 2315 |
| 16 | 5302 |
| 17 | 12382 |
| 18 | 29495 |
| 19 | 71450 |
| 20 | 175618 |
| 21 | 437272 |
| 22 | 1101000 |
| 23 | 2799768 |
| 24 | 7181703 |
| 25 | 18565546 |
| 26 | 48326482 |
| 27 | 126581749 |
| 28 | 333424119 |
| 29 | 882765486 |
| 30 | 2348114866 |
| 31 | 6272676477 |
| 32 | 16822741588 |
| 33 | 45281587081 |
| 34 | 122295734356 |
| 35 | 331331765694 |