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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 26 |
| 5 | 66 |
| 6 | 160 |
| 7 | 372 |
| 8 | 840 |
| 9 | 1864 |
| 10 | 4096 |
| 11 | 8944 |
| 12 | 19424 |
| 13 | 41952 |
| 14 | 90112 |
| 15 | 192576 |
| 16 | 409728 |
| 17 | 868480 |
| 18 | 1835008 |
| 19 | 3866368 |
| 20 | 8125952 |
| 21 | 17038848 |
| 22 | 35651584 |
| 23 | 74449920 |
| 24 | 155191296 |
| 25 | 322963456 |
| 26 | 671088640 |
| 27 | 1392504832 |
| 28 | 2885672960 |
| 29 | 5972680704 |
| 30 | 12348030976 |
| 31 | 25501384704 |