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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 13 |
| 8 | 36 |
| 9 | 93 |
| 10 | 225 |
| 11 | 528 |
| 12 | 1198 |
| 13 | 2666 |
| 14 | 5815 |
| 15 | 12517 |
| 16 | 26587 |
| 17 | 55933 |
| 18 | 116564 |
| 19 | 241151 |
| 20 | 495417 |
| 21 | 1011950 |
| 22 | 2055892 |
| 23 | 4157514 |
| 24 | 8371318 |
| 25 | 16792066 |
| 26 | 33564256 |
| 27 | 66875221 |
| 28 | 132849983 |
| 29 | 263192599 |
| 30 | 520087551 |
| 31 | 1025295487 |
| 32 | 2016745784 |
| 33 | 3958608430 |
| 34 | 7754810743 |