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 | 252 |
| 4 | -1472 |
| 5 | 4830 |
| 6 | -16744 |
| 7 | 84480 |
| 8 | -113643 |
| 9 | 534612 |
| 10 | -577738 |
| 11 | 987136 |
| 12 | -6905934 |
| 13 | 10661420 |
| 14 | 18643272 |
| 15 | -25499225 |
| 16 | -73279080 |
| 17 | 128406630 |
| 18 | -52843168 |
| 19 | -196706304 |
| 20 | -182213314 |
| 21 | 308120442 |
| 22 | -17125708 |
| 23 | 2687348496 |
| 24 | -1696965207 |
| 25 | -1596055698 |
| 26 | -5189203740 |
| 27 | 6956478662 |
| 28 | 2699296768 |
| 29 | -15481826884 |
| 30 | 9791485272 |