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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 8 |
| 6 | 22 |
| 7 | 58 |
| 8 | 151 |
| 9 | 392 |
| 10 | 1013 |
| 11 | 2612 |
| 12 | 6728 |
| 13 | 17318 |
| 14 | 44564 |
| 15 | 114671 |
| 16 | 295099 |
| 17 | 759576 |
| 18 | 1955657 |
| 19 | 5036741 |
| 20 | 12976355 |
| 21 | 33443190 |
| 22 | 86221745 |
| 23 | 222371926 |
| 24 | 573713958 |
| 25 | 1480677048 |
| 26 | 3822708372 |
| 27 | 9872424913 |
| 28 | 25504336609 |
| 29 | 65907869404 |
| 30 | 170368399138 |