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 | 1 |
| 6 | 1 |
| 7 | 5 |
| 8 | 30 |
| 9 | 96 |
| 10 | 245 |
| 11 | 592 |
| 12 | 1543 |
| 13 | 4884 |
| 14 | 17660 |
| 15 | 64495 |
| 16 | 226442 |
| 17 | 766937 |
| 18 | 2558655 |
| 19 | 8590293 |
| 20 | 29408344 |
| 21 | 102893203 |
| 22 | 366035420 |
| 23 | 1314955687 |
| 24 | 4747101946 |
| 25 | 17184305311 |
| 26 | 62359953380 |
| 27 | 226978626707 |
| 28 | 829122987011 |
| 29 | 3040369502702 |
| 30 | 11191473790567 |
| 31 | 41342469523031 |