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 | -26 |
| 2 | 299 |
| 3 | -1950 |
| 4 | 7475 |
| 5 | -13754 |
| 6 | -12220 |
| 7 | 132756 |
| 8 | -276575 |
| 9 | 0 |
| 10 | 1010100 |
| 11 | -1486030 |
| 12 | -519961 |
| 13 | 2486300 |
| 14 | 829725 |
| 15 | -2215486 |
| 16 | -11643060 |
| 17 | 18523050 |
| 18 | 16317925 |
| 19 | -42861650 |
| 20 | 0 |
| 21 | 11010090 |
| 22 | 59644221 |
| 23 | -5743400 |
| 24 | -138219900 |