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 | 1 |
| 10 | 9 |
| 11 | 54 |
| 12 | 276 |
| 13 | 1282 |
| 14 | 5585 |
| 15 | 23223 |
| 16 | 93146 |
| 17 | 362928 |
| 18 | 1380535 |
| 19 | 5145692 |
| 20 | 18846775 |
| 21 | 67982489 |
| 22 | 241940204 |
| 23 | 850777688 |
| 24 | 2959796467 |
| 25 | 10197732687 |
| 26 | 34828459508 |
| 27 | 118003182174 |
| 28 | 396897710483 |
| 29 | 1326018464696 |
| 30 | 4402883891950 |
| 31 | 14536059784925 |
| 32 | 47737688829399 |