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) |
|---|---|
| 47 | 1 |
| 48 | 48 |
| 49 | 1176 |
| 50 | 19600 |
| 51 | 249900 |
| 52 | 2598960 |
| 53 | 22957480 |
| 54 | 177100560 |
| 55 | 1217566350 |
| 56 | 7575968400 |
| 57 | 43183019880 |
| 58 | 227692286640 |
| 59 | 1119487075980 |
| 60 | 5166863427600 |
| 61 | 22512762077400 |
| 62 | 93052749919920 |
| 63 | 366395202809685 |
| 64 | 1379370175283520 |
| 65 | 4981058966301600 |
| 66 | 17302625882942400 |
| 67 | 57963796707857040 |