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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 6 |
| 6 | 31 |
| 7 | 106 |
| 8 | 281 |
| 9 | 946 |
| 10 | 7561 |
| 11 | 54286 |
| 12 | 281161 |
| 13 | 1207636 |
| 14 | 7997991 |
| 15 | 81996916 |
| 16 | 701522641 |
| 17 | 4580581916 |
| 18 | 29742355441 |
| 19 | 306369616636 |
| 20 | 3632198902321 |
| 21 | 34710574441096 |
| 22 | 276645112305871 |
| 23 | 2652825718776696 |
| 24 | 35647605796451881 |
| 25 | 458142859493786776 |