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) |
|---|---|
| 8 | 0 |
| 9 | 429 |
| 10 | 5005 |
| 11 | 32032 |
| 12 | 148512 |
| 13 | 556920 |
| 14 | 1790712 |
| 15 | 5116320 |
| 16 | 13302432 |
| 17 | 32008977 |
| 18 | 72177105 |
| 19 | 153977824 |
| 20 | 313112800 |
| 21 | 610569960 |
| 22 | 1147334760 |
| 23 | 2086063200 |
| 24 | 3682355040 |
| 25 | 6329047725 |
| 26 | 10617908301 |
| 27 | 17424259776 |
| 28 | 28021470400 |
| 29 | 44233892560 |
| 30 | 68638798800 |
| 31 | 104830165440 |
| 32 | 157759842240 |