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 | -2 |
| 2 | 3 |
| 3 | 3 |
| 4 | -7 |
| 5 | -12 |
| 6 | -7 |
| 7 | 25 |
| 8 | 48 |
| 9 | 48 |
| 10 | 25 |
| 11 | -121 |
| 12 | -260 |
| 13 | -240 |
| 14 | -260 |
| 15 | -121 |
| 16 | 721 |
| 17 | 1830 |
| 18 | 1500 |
| 19 | 1500 |
| 20 | 1830 |
| 21 | 721 |
| 22 | -5041 |
| 23 | -15162 |
| 24 | -13230 |
| 25 | -8400 |
| 26 | -13230 |
| 27 | -15162 |
| 28 | -5041 |
| 29 | 40321 |
| 30 | 141176 |
| 31 | 142296 |
| 32 | 70560 |
| 33 | 70560 |
| 34 | 142296 |
| 35 | 141176 |
| 36 | 40321 |
| 37 | -362881 |
| 38 | -1451592 |
| 39 | -1695456 |
| 40 | -874944 |
| 41 | -423360 |
| 42 | -874944 |
| 43 | -1695456 |
| 44 | -1451592 |
| 45 | -362881 |