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 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 0 |
| 4 | 12 |
| 5 | 2 |
| 6 | 50 |
| 7 | 16 |
| 8 | 210 |
| 9 | 100 |
| 10 | 888 |
| 11 | 558 |
| 12 | 3778 |
| 13 | 2926 |
| 14 | 16164 |
| 15 | 14758 |
| 16 | 69520 |
| 17 | 72504 |
| 18 | 300458 |
| 19 | 349586 |
| 20 | 1304390 |
| 21 | 1662320 |
| 22 | 5686114 |
| 23 | 7821308 |
| 24 | 24879632 |
| 25 | 36497742 |
| 26 | 109227706 |
| 27 | 169207550 |
| 28 | 480982532 |
| 29 | 780370350 |
| 30 | 2123682344 |
| 31 | 3583760736 |
| 32 | 9398963962 |
| 33 | 16400994810 |
| 34 | 41684827750 |