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 | 312 |
| 3 | 560 |
| 4 | 588 |
| 5 | 1400 |
| 6 | 23760 |
| 7 | 59400 |
| 8 | 85632 |
| 9 | 147492 |
| 10 | 153720 |
| 11 | 556160 |
| 12 | 569328 |
| 13 | 1590816 |
| 14 | 2013216 |
| 15 | 3343776 |
| 16 | 4563000 |
| 17 | 4695456 |
| 18 | 9745728 |
| 19 | 12558912 |
| 20 | 22013952 |
| 21 | 23336172 |
| 22 | 30002960 |
| 23 | 45326160 |
| 24 | 52021242 |
| 25 | 75007400 |
| 26 | 113315400 |
| 27 | 137617728 |
| 28 | 153587720 |
| 29 | 402831360 |
| 30 | 699117024 |