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 | 0 |
| 4 | 4 |
| 5 | 13 |
| 6 | 36 |
| 7 | 92 |
| 8 | 224 |
| 9 | 528 |
| 10 | 1216 |
| 11 | 2752 |
| 12 | 6144 |
| 13 | 13568 |
| 14 | 29696 |
| 15 | 64512 |
| 16 | 139264 |
| 17 | 299008 |
| 18 | 638976 |
| 19 | 1359872 |
| 20 | 2883584 |
| 21 | 6094848 |
| 22 | 12845056 |
| 23 | 27000832 |
| 24 | 56623104 |
| 25 | 118489088 |
| 26 | 247463936 |
| 27 | 515899392 |
| 28 | 1073741824 |
| 29 | 2231369728 |
| 30 | 4630511616 |
| 31 | 9596567552 |
| 32 | 19864223744 |
| 33 | 41070624768 |
| 34 | 84825604096 |
| 35 | 175019917312 |