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 | 2 |
| 6 | 3 |
| 7 | 9 |
| 8 | 16 |
| 9 | 39 |
| 10 | 75 |
| 11 | 165 |
| 12 | 318 |
| 13 | 672 |
| 14 | 1323 |
| 15 | 2703 |
| 16 | 5376 |
| 17 | 10880 |
| 18 | 21663 |
| 19 | 43605 |
| 20 | 87040 |
| 21 | 174564 |
| 22 | 348843 |
| 23 | 698709 |
| 24 | 1396680 |
| 25 | 2795518 |
| 26 | 5589675 |
| 27 | 11183325 |
| 28 | 22364160 |
| 29 | 44736512 |
| 30 | 89467320 |
| 31 | 178951509 |
| 32 | 357892096 |
| 33 | 715816464 |
| 34 | 1431612075 |
| 35 | 2863289674 |
| 36 | 5726534688 |
| 37 | 11453202432 |