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 | 0 |
| 4 | 4 |
| 5 | -3 |
| 6 | -4 |
| 7 | 1 |
| 8 | 14 |
| 9 | -10 |
| 10 | -14 |
| 11 | 4 |
| 12 | 39 |
| 13 | -26 |
| 14 | -40 |
| 15 | 13 |
| 16 | 101 |
| 17 | -65 |
| 18 | -105 |
| 19 | 36 |
| 20 | 238 |
| 21 | -147 |
| 22 | -251 |
| 23 | 91 |
| 24 | 534 |
| 25 | -322 |
| 26 | -569 |
| 27 | 212 |
| 28 | 1135 |
| 29 | -666 |
| 30 | -1222 |
| 31 | 469 |
| 32 | 2328 |
| 33 | -1340 |
| 34 | -2526 |
| 35 | 987 |
| 36 | 4606 |
| 37 | -2600 |
| 38 | -5035 |
| 39 | 2002 |
| 40 | 8867 |
| 41 | -4928 |
| 42 | -9751 |
| 43 | 3926 |
| 44 | 16624 |
| 45 | -9100 |
| 46 | -18382 |
| 47 | 7488 |
| 48 | 30499 |