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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 6 |
| 12 | 22 |
| 13 | 239 |
| 14 | 653 |
| 15 | 4089 |
| 16 | 25411 |
| 17 | 166463 |
| 18 | 1115871 |
| 19 | 8062150 |
| 20 | 61984976 |
| 21 | 497236090 |
| 22 | 4261538564 |
| 23 | 38352532487 |
| 24 | 360400504834 |
| 25 | 3518014210402 |
| 26 | 35752764285788 |