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 | 3 |
| 2 | 10 |
| 3 | 36 |
| 4 | 136 |
| 5 | 528 |
| 6 | 2080 |
| 7 | 8256 |
| 8 | 32896 |
| 9 | 131328 |
| 10 | 524800 |
| 11 | 2098176 |
| 12 | 8390656 |
| 13 | 33558528 |
| 14 | 134225920 |
| 15 | 536887296 |
| 16 | 2147516416 |
| 17 | 8590000128 |
| 18 | 34359869440 |
| 19 | 137439215616 |
| 20 | 549756338176 |
| 21 | 2199024304128 |
| 22 | 8796095119360 |
| 23 | 35184376283136 |
| 24 | 140737496743936 |
| 25 | 562949970198528 |