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) |
|---|---|
| 17 | 1 |
| 18 | -17 |
| 19 | 136 |
| 20 | -680 |
| 21 | 2363 |
| 22 | -5916 |
| 23 | 10319 |
| 24 | -9656 |
| 25 | -8534 |
| 26 | 57426 |
| 27 | -133076 |
| 28 | 190383 |
| 29 | -134810 |
| 30 | -140148 |
| 31 | 657611 |
| 32 | -1240116 |
| 33 | 1461337 |
| 34 | -770917 |
| 35 | -1171504 |
| 36 | 4061946 |
| 37 | -6678161 |
| 38 | 7071269 |
| 39 | -3376863 |
| 40 | -4939180 |
| 41 | 15963612 |
| 42 | -25098443 |
| 43 | 26265408 |
| 44 | -14513461 |
| 45 | -10810368 |
| 46 | 43792034 |