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 | 7 |
| 2 | 14 |
| 3 | -42 |
| 4 | -294 |
| 5 | -462 |
| 6 | 1386 |
| 7 | 7722 |
| 8 | 9009 |
| 9 | -37037 |
| 10 | -160160 |
| 11 | -123760 |
| 12 | 835380 |
| 13 | 2848860 |
| 14 | 1046520 |
| 15 | -16550520 |
| 16 | -45140865 |
| 17 | 3533145 |
| 18 | 296447690 |
| 19 | 648593330 |
| 20 | -393463070 |
| 21 | -4895709390 |
| 22 | -8489647530 |
| 23 | 10975099590 |
| 24 | 75528298755 |
| 25 | 100311659721 |
| 26 | -230350834728 |
| 27 | -1097798696456 |