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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 14 |
| 6 | 42 |
| 7 | 114 |
| 8 | 304 |
| 9 | 748 |
| 10 | 1870 |
| 11 | 4370 |
| 12 | 10488 |
| 13 | 23748 |
| 14 | 55412 |
| 15 | 122836 |
| 16 | 280768 |
| 17 | 613016 |
| 18 | 1379286 |
| 19 | 2977362 |
| 20 | 6616360 |
| 21 | 14156500 |
| 22 | 31144300 |
| 23 | 66168476 |
| 24 | 144367584 |
| 25 | 304960104 |
| 26 | 660746892 |
| 27 | 1389097684 |
| 28 | 2991902704 |
| 29 | 6264621608 |
| 30 | 13424189160 |
| 31 | 28011759720 |
| 32 | 59758420736 |
| 33 | 124325484592 |
| 34 | 264191654758 |
| 35 | 548218962386 |