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 | -4 |
| 2 | 1 |
| 3 | -11 |
| 4 | 6 |
| 5 | -1 |
| 6 | -26 |
| 7 | 23 |
| 8 | -8 |
| 9 | 1 |
| 10 | -57 |
| 11 | 72 |
| 12 | -39 |
| 13 | 10 |
| 14 | -1 |
| 15 | -120 |
| 16 | 201 |
| 17 | -150 |
| 18 | 59 |
| 19 | -12 |
| 20 | 1 |
| 21 | -247 |
| 22 | 522 |
| 23 | -501 |
| 24 | 268 |
| 25 | -83 |
| 26 | 14 |
| 27 | -1 |
| 28 | -502 |
| 29 | 1291 |
| 30 | -1524 |
| 31 | 1037 |
| 32 | -434 |
| 33 | 111 |
| 34 | -16 |
| 35 | 1 |
| 36 | -1013 |
| 37 | 3084 |
| 38 | -4339 |
| 39 | 3598 |
| 40 | -1905 |
| 41 | 656 |
| 42 | -143 |
| 43 | 18 |
| 44 | -1 |
| 45 | -2036 |
| 46 | 7181 |
| 47 | -11762 |
| 48 | 11535 |
| 49 | -7408 |
| 50 | 3217 |
| 51 | -942 |
| 52 | 179 |
| 53 | -20 |
| 54 | 1 |