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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 1 |
| 8 | 8 |
| 9 | 9 |
| 10 | 45 |
| 11 | 55 |
| 12 | 220 |
| 13 | 286 |
| 14 | 1001 |
| 15 | 1365 |
| 16 | 4368 |
| 17 | 6188 |
| 18 | 18564 |
| 19 | 27132 |
| 20 | 77520 |
| 21 | 116280 |
| 22 | 319770 |
| 23 | 490314 |
| 24 | 1307504 |
| 25 | 2042975 |
| 26 | 5311735 |
| 27 | 8436285 |
| 28 | 21474180 |
| 29 | 34597290 |
| 30 | 86493225 |
| 31 | 141120525 |
| 32 | 347373600 |