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 | 3 |
| 5 | 5 |
| 6 | 17 |
| 7 | 44 |
| 8 | 182 |
| 9 | 730 |
| 10 | 4032 |
| 11 | 25598 |
| 12 | 212780 |
| 13 | 2241730 |
| 14 | 31193324 |
| 15 | 575252112 |
| 16 | 14218209962 |
| 17 | 472740425319 |
| 18 | 21208887576786 |
| 19 | 1286099113807999 |
| 20 | 105567921675718772 |
| 21 | 11743905783670560579 |
| 22 | 1772771666309380358809 |
| 23 | 363526952035325887859823 |
| 24 | 101386021137641794979558045 |