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 | -1 |
| 2 | 1 |
| 3 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | -1 |
| 7 | 5 |
| 8 | 3 |
| 9 | -13 |
| 10 | 19 |
| 11 | -41 |
| 12 | 9 |
| 13 | 55 |
| 14 | -55 |
| 15 | 113 |
| 16 | -99 |
| 17 | 65 |
| 18 | -113 |
| 19 | -491 |
| 20 | 843 |
| 21 | -245 |
| 22 | -325 |
| 23 | 1295 |
| 24 | -783 |
| 25 | -121 |
| 26 | -887 |
| 27 | -287 |
| 28 | 2685 |
| 29 | -6911 |
| 30 | 7559 |
| 31 | 12413 |
| 32 | -36669 |
| 33 | 12179 |
| 34 | 42211 |
| 35 | -59681 |
| 36 | 55281 |
| 37 | -22313 |
| 38 | 38633 |
| 39 | 19361 |
| 40 | -465579 |
| 41 | 877913 |
| 42 | -711185 |
| 43 | -575339 |
| 44 | 2540955 |
| 45 | -3065165 |
| 46 | 1681907 |
| 47 | -29953 |
| 48 | -1287375 |
| 49 | 7293527 |
| 50 | -19374047 |