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 | 3 |
| 3 | 26 |
| 4 | 426 |
| 5 | 11064 |
| 6 | 413640 |
| 7 | 20946960 |
| 8 | 1377648720 |
| 9 | 114078384000 |
| 10 | 11611761920640 |
| 11 | 1425189271161600 |
| 12 | 207609729886944000 |
| 13 | 35419018603306060800 |
| 14 | 6996657393055480550400 |
| 15 | 1584616114318716544665600 |
| 16 | 407930516160959891683584000 |
| 17 | 118458533875304716189544448000 |