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 | 1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | -2 |
| 8 | 1 |
| 9 | 3 |
| 10 | -4 |
| 11 | -3 |
| 12 | 11 |
| 13 | -2 |
| 14 | -22 |
| 15 | 21 |
| 16 | 32 |
| 17 | -72 |
| 18 | -18 |
| 19 | 180 |
| 20 | -95 |
| 21 | -350 |
| 22 | 496 |
| 23 | 449 |
| 24 | -1542 |
| 25 | 125 |
| 26 | 3638 |
| 27 | -3161 |
| 28 | -6393 |
| 29 | 12780 |
| 30 | 5636 |
| 31 | -35993 |
| 32 | 14509 |
| 33 | 77907 |
| 34 | -97880 |
| 35 | -116880 |
| 36 | 337924 |
| 37 | 24514 |
| 38 | -869531 |
| 39 | 631306 |
| 40 | 1692540 |
| 41 | -2949009 |
| 42 | -1933940 |
| 43 | 9035577 |
| 44 | -2312868 |
| 45 | -21166895 |