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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 19 |
| 6 | 63 |
| 7 | 220 |
| 8 | 795 |
| 9 | 2942 |
| 10 | 11099 |
| 11 | 42536 |
| 12 | 165126 |
| 13 | 647955 |
| 14 | 2565946 |
| 15 | 10241616 |
| 16 | 41158598 |
| 17 | 166402323 |
| 18 | 676338003 |
| 19 | 2761988994 |
| 20 | 11327162406 |
| 21 | 46631572295 |
| 22 | 192638451780 |
| 23 | 798316442580 |
| 24 | 3317866307145 |
| 25 | 13825837134096 |