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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 8 |
| 7 | 16 |
| 8 | 24 |
| 9 | 42 |
| 10 | 69 |
| 11 | 124 |
| 12 | 208 |
| 13 | 378 |
| 14 | 668 |
| 15 | 1214 |
| 16 | 2220 |
| 17 | 4110 |
| 18 | 7630 |
| 19 | 14308 |
| 20 | 26931 |
| 21 | 50944 |
| 22 | 96782 |
| 23 | 184408 |
| 24 | 352450 |
| 25 | 675180 |
| 26 | 1296477 |
| 27 | 2493680 |
| 28 | 4805388 |
| 29 | 9272778 |
| 30 | 17919558 |
| 31 | 34669600 |