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) |
|---|---|
| 3 | 24 |
| 4 | 232 |
| 5 | 954 |
| 6 | 8560 |
| 7 | 33648 |
| 8 | 297940 |
| 9 | 1159844 |
| 10 | 10242416 |
| 11 | 39809076 |
| 12 | 351561242 |
| 13 | 1367463642 |
| 14 | 12086555584 |
| 15 | 47082494816 |
| 16 | 416589513644 |
| 17 | 1625447736120 |
| 18 | 14397549291280 |
| 19 | 56265306436584 |
| 20 | 498879779964188 |
| 21 | 1952476424575980 |
| 22 | 17327820010494464 |
| 23 | 67907006619888744 |