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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 7 |
| 10 | 51 |
| 11 | 361 |
| 12 | 2484 |
| 13 | 16749 |
| 14 | 113662 |
| 15 | 784390 |
| 16 | 5517476 |
| 17 | 39291974 |
| 18 | 280215385 |
| 19 | 1979345466 |
| 20 | 13726798428 |
| 21 | 92895863119 |
| 22 | 611213599093 |
| 23 | 3902188079125 |
| 24 | 24154847660481 |
| 25 | 144967854078943 |