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 | 3 |
| 4 | 1 |
| 5 | -8 |
| 6 | 13 |
| 7 | 1 |
| 8 | 11 |
| 9 | -61 |
| 10 | 73 |
| 11 | -19 |
| 12 | 66 |
| 13 | 66 |
| 14 | -494 |
| 15 | 501 |
| 16 | 151 |
| 17 | -993 |
| 18 | 2102 |
| 19 | -298 |
| 20 | -4293 |
| 21 | 4051 |
| 22 | -1091 |
| 23 | 9528 |
| 24 | -33249 |
| 25 | 52816 |
| 26 | -21069 |
| 27 | -39528 |
| 28 | 37633 |
| 29 | 7841 |
| 30 | -82857 |
| 31 | 378261 |
| 32 | -929101 |
| 33 | 1207299 |
| 34 | -560187 |
| 35 | -375289 |
| 36 | 394353 |
| 37 | -56519 |
| 38 | 692422 |
| 39 | -3832928 |
| 40 | 12255802 |
| 41 | -23834210 |
| 42 | 26643994 |
| 43 | -12620672 |
| 44 | -3481562 |
| 45 | 4596553 |