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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 2 |
| 12 | 5 |
| 13 | 12 |
| 14 | 27 |
| 15 | 56 |
| 16 | 110 |
| 17 | 212 |
| 18 | 397 |
| 19 | 734 |
| 20 | 1339 |
| 21 | 2414 |
| 22 | 4316 |
| 23 | 7659 |
| 24 | 13507 |
| 25 | 23691 |
| 26 | 41362 |
| 27 | 71920 |
| 28 | 124603 |
| 29 | 215188 |
| 30 | 370565 |
| 31 | 636491 |
| 32 | 1090709 |
| 33 | 1865121 |
| 34 | 3183224 |
| 35 | 5423255 |
| 36 | 9224601 |
| 37 | 15666968 |
| 38 | 26571801 |
| 39 | 45009002 |
| 40 | 76148146 |
| 41 | 128687426 |