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 | -3 |
| 2 | -3 |
| 3 | 8 |
| 4 | 12 |
| 5 | 9 |
| 6 | -29 |
| 7 | -54 |
| 8 | -51 |
| 9 | 8 |
| 10 | 168 |
| 11 | 273 |
| 12 | 270 |
| 13 | -18 |
| 14 | -546 |
| 15 | -1220 |
| 16 | -1539 |
| 17 | -969 |
| 18 | 796 |
| 19 | 3693 |
| 20 | 6591 |
| 21 | 8098 |
| 22 | 5412 |
| 23 | -2568 |
| 24 | -16053 |
| 25 | -31524 |
| 26 | -42195 |
| 27 | -38684 |
| 28 | -11868 |
| 29 | 41994 |
| 30 | 117630 |
| 31 | 193365 |
| 32 | 235497 |
| 33 | 197758 |
| 34 | 42852 |
| 35 | -247224 |
| 36 | -639547 |
| 37 | -1041432 |
| 38 | -1291425 |
| 39 | -1184100 |
| 40 | -520650 |