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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | -4 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 6 |
| 9 | -9 |
| 10 | 0 |
| 11 | 0 |
| 12 | -4 |
| 13 | 36 |
| 14 | -14 |
| 15 | 0 |
| 16 | 1 |
| 17 | -54 |
| 18 | 92 |
| 19 | -19 |
| 20 | 0 |
| 21 | 36 |
| 22 | -228 |
| 23 | 202 |
| 24 | -24 |
| 25 | -9 |
| 26 | 272 |
| 27 | -702 |
| 28 | 358 |
| 29 | -29 |
| 30 | -158 |
| 31 | 1168 |
| 32 | -1696 |
| 33 | 598 |
| 34 | 2 |
| 35 | -1027 |
| 36 | 3810 |
| 37 | -3605 |
| 38 | 904 |
| 39 | 423 |
| 40 | -4600 |
| 41 | 10196 |
| 42 | -6898 |
| 43 | 1240 |
| 44 | 2990 |
| 45 | -15805 |
| 46 | 24104 |
| 47 | -12242 |
| 48 | 822 |
| 49 | 14005 |
| 50 | -46090 |
| 51 | 51376 |