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 | 1 |
| 4 | 1 |
| 5 | 0 |
| 6 | 3 |
| 7 | 6 |
| 8 | 3 |
| 9 | 12 |
| 10 | 36 |
| 11 | 36 |
| 12 | 67 |
| 13 | 220 |
| 14 | 330 |
| 15 | 493 |
| 16 | 1420 |
| 17 | 2730 |
| 18 | 4158 |
| 19 | 9933 |
| 20 | 21693 |
| 21 | 36312 |
| 22 | 75684 |
| 23 | 171360 |
| 24 | 316011 |
| 25 | 617424 |
| 26 | 1374156 |
| 27 | 2723667 |
| 28 | 5256237 |
| 29 | 11303028 |
| 30 | 23362779 |
| 31 | 45734304 |
| 32 | 95506488 |
| 33 | 200821140 |
| 34 | 401891490 |
| 35 | 825565455 |
| 36 | 1739179533 |
| 37 | 3549322296 |