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 | 1 |
| 3 | 1 |
| 4 | 10 |
| 5 | 54 |
| 6 | 204 |
| 7 | 243 |
| 8 | 1594 |
| 9 | 4210 |
| 10 | 18484 |
| 11 | 62174 |
| 12 | 275828 |
| 13 | 1131980 |
| 14 | 7434360 |
| 15 | 10522755 |
| 16 | 72469530 |
| 17 | 268486410 |
| 18 | 1442238420 |
| 19 | 4284331050 |
| 20 | 18146556060 |
| 21 | 62021100660 |
| 22 | 248289237960 |
| 23 | 798007353390 |
| 24 | 2832660378756 |
| 25 | 11922780597588 |