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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 30 |
| 5 | 70 |
| 6 | 160 |
| 7 | 364 |
| 8 | 824 |
| 9 | 1848 |
| 10 | 4096 |
| 11 | 8976 |
| 12 | 19488 |
| 13 | 42016 |
| 14 | 90112 |
| 15 | 192448 |
| 16 | 409472 |
| 17 | 868224 |
| 18 | 1835008 |
| 19 | 3866880 |
| 20 | 8126976 |
| 21 | 17039872 |
| 22 | 35651584 |
| 23 | 74447872 |
| 24 | 155187200 |
| 25 | 322959360 |
| 26 | 671088640 |
| 27 | 1392513024 |
| 28 | 2885689344 |
| 29 | 5972697088 |
| 30 | 12348030976 |
| 31 | 25501351936 |
| 32 | 52613316608 |