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 | 1 |
| 1 | 1300 |
| 2 | 239252 |
| 3 | 14797120 |
| 4 | 410468500 |
| 5 | 6030043240 |
| 6 | 54177864000 |
| 7 | 343594659200 |
| 8 | 1706685733012 |
| 9 | 7010460268500 |
| 10 | 24832297608040 |
| 11 | 77924078814400 |
| 12 | 221394909419840 |
| 13 | 578472382307304 |
| 14 | 1407681394953600 |
| 15 | 3221568346322560 |
| 16 | 6988918697572500 |
| 17 | 14466438251512104 |