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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 11 |
| 7 | 12 |
| 8 | 21 |
| 9 | 31 |
| 10 | 112 |
| 11 | 122 |
| 12 | 212 |
| 13 | 294 |
| 14 | 456 |
| 15 | 1147 |
| 16 | 1381 |
| 17 | 2144 |
| 18 | 3059 |
| 19 | 4494 |
| 20 | 6081 |
| 21 | 13597 |
| 22 | 15928 |
| 23 | 24716 |
| 24 | 33728 |
| 25 | 49260 |
| 26 | 65016 |
| 27 | 93229 |
| 28 | 169249 |
| 29 | 210206 |
| 30 | 304979 |
| 31 | 417600 |
| 32 | 584037 |
| 33 | 779731 |
| 34 | 1076824 |
| 35 | 1409102 |
| 36 | 2418068 |
| 37 | 2950722 |
| 38 | 4213584 |
| 39 | 5581351 |
| 40 | 7779829 |