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 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 4 |
| 12 | 19 |
| 13 | 47 |
| 14 | 287 |
| 15 | 1002 |
| 16 | 3365 |
| 17 | 10853 |
| 18 | 34088 |
| 19 | 104574 |
| 20 | 315116 |
| 21 | 935321 |
| 22 | 2743364 |
| 23 | 7966723 |
| 24 | 22951010 |
| 25 | 65681536 |