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 | 1 |
| 2 | 24 |
| 3 | 236 |
| 4 | 1400 |
| 5 | 6009 |
| 6 | 20608 |
| 7 | 59952 |
| 8 | 153792 |
| 9 | 357225 |
| 10 | 765688 |
| 11 | 1535820 |
| 12 | 2913560 |
| 13 | 5270993 |
| 14 | 9153600 |
| 15 | 15339712 |
| 16 | 24914112 |
| 17 | 39357873 |
| 18 | 60656664 |
| 19 | 91429900 |
| 20 | 135083256 |
| 21 | 195987209 |
| 22 | 279684416 |
| 23 | 393128880 |
| 24 | 544960000 |
| 25 | 745814745 |
| 26 | 1008681336 |
| 27 | 1349297964 |
| 28 | 1786600216 |
| 29 | 2343221025 |