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 | 10 |
| 4 | 36 |
| 5 | 129 |
| 6 | 471 |
| 7 | 1744 |
| 8 | 6531 |
| 9 | 24643 |
| 10 | 93541 |
| 11 | 356808 |
| 12 | 1366632 |
| 13 | 5252532 |
| 14 | 20247138 |
| 15 | 78245742 |
| 16 | 303053351 |
| 17 | 1176042891 |
| 18 | 4571690601 |
| 19 | 17799156930 |
| 20 | 69394115895 |
| 21 | 270886964569 |
| 22 | 1058633284203 |
| 23 | 4141439892120 |
| 24 | 16216887541767 |