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 | 3 |
| 3 | 9 |
| 4 | 36 |
| 5 | 151 |
| 6 | 750 |
| 7 | 3959 |
| 8 | 22857 |
| 9 | 140031 |
| 10 | 909388 |
| 11 | 6202031 |
| 12 | 44256875 |
| 13 | 328994157 |
| 14 | 2540242646 |
| 15 | 20317980102 |
| 16 | 167980915848 |
| 17 | 1432808198569 |
| 18 | 12587788263807 |
| 19 | 113739153822878 |
| 20 | 1055610955120803 |
| 21 | 10051265993496814 |
| 22 | 98083750658261085 |
| 23 | 979961276867802001 |
| 24 | 10015362142357613001 |