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 | 6 |
| 1 | 1 |
| 2 | -3 |
| 3 | 1 |
| 4 | 17 |
| 5 | 16 |
| 6 | -15 |
| 7 | -13 |
| 8 | 81 |
| 9 | 127 |
| 10 | -58 |
| 11 | -175 |
| 12 | 329 |
| 13 | 885 |
| 14 | -31 |
| 15 | -1424 |
| 16 | 833 |
| 17 | 5543 |
| 18 | 2181 |
| 19 | -9233 |
| 20 | -2298 |
| 21 | 31025 |
| 22 | 27893 |
| 23 | -49495 |
| 24 | -54879 |
| 25 | 150416 |
| 26 | 245697 |
| 27 | -204965 |
| 28 | -526887 |
| 29 | 570895 |
| 30 | 1801670 |
| 31 | -407711 |
| 32 | -3882303 |
| 33 | 946397 |
| 34 | 11542929 |
| 35 | 3442672 |
| 36 | -24121039 |
| 37 | -10317745 |
| 38 | 64959629 |
| 39 | 56727711 |
| 40 | -127083514 |