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 | -25 |
| 3 | 251 |
| 4 | -1448 |
| 5 | 4829 |
| 6 | -6275 |
| 7 | -16745 |
| 8 | 85952 |
| 9 | -113895 |
| 10 | -120725 |
| 11 | 534611 |
| 12 | -363448 |
| 13 | -577739 |
| 14 | 418625 |
| 15 | 1212079 |
| 16 | 902656 |
| 17 | -6905935 |
| 18 | 2847375 |
| 19 | 10661419 |
| 20 | -6992392 |
| 21 | -4202995 |
| 22 | -13365275 |
| 23 | 18643271 |
| 24 | 21573952 |
| 25 | -25504055 |
| 26 | 14443475 |
| 27 | -73165437 |
| 28 | 24246760 |
| 29 | 128406629 |
| 30 | -30301975 |