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 | 2 |
| 4 | 2 |
| 5 | 2 |
| 6 | 15 |
| 7 | 32 |
| 8 | 53 |
| 9 | 192 |
| 10 | 527 |
| 11 | 1152 |
| 12 | 3327 |
| 13 | 9578 |
| 14 | 24217 |
| 15 | 66528 |
| 16 | 190357 |
| 17 | 515692 |
| 18 | 1421172 |
| 19 | 4036034 |
| 20 | 11272501 |
| 21 | 31489762 |
| 22 | 89370575 |
| 23 | 253106188 |
| 24 | 715642419 |
| 25 | 2038291672 |
| 26 | 5816775442 |
| 27 | 16592350656 |
| 28 | 47490009821 |
| 29 | 136246784272 |
| 30 | 391111252072 |
| 31 | 1124779108330 |