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 | -2 |
| 2 | 0 |
| 3 | 5 |
| 4 | -7 |
| 5 | -3 |
| 6 | 22 |
| 7 | -23 |
| 8 | -24 |
| 9 | 92 |
| 10 | -67 |
| 11 | -141 |
| 12 | 367 |
| 13 | -152 |
| 14 | -723 |
| 15 | 1394 |
| 16 | -100 |
| 17 | -3411 |
| 18 | 5005 |
| 19 | 1717 |
| 20 | -15138 |
| 21 | 16709 |
| 22 | 15284 |
| 23 | -63840 |
| 24 | 49981 |
| 25 | 92983 |
| 26 | -256785 |
| 27 | 120800 |
| 28 | 485753 |
| 29 | -984138 |
| 30 | 133432 |
| 31 | 2320597 |
| 32 | -3571599 |
| 33 | -936163 |
| 34 | 10399958 |
| 35 | -12099231 |
| 36 | -9636848 |
| 37 | 44235268 |
| 38 | -37060803 |
| 39 | -61046581 |
| 40 | 179403455 |