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 | 1 |
| 2 | 0 |
| 3 | -2 |
| 4 | 2 |
| 5 | -5 |
| 6 | 9 |
| 7 | -3 |
| 8 | -13 |
| 9 | 14 |
| 10 | 35 |
| 11 | -149 |
| 12 | 300 |
| 13 | -450 |
| 14 | 673 |
| 15 | -1151 |
| 16 | 1856 |
| 17 | -2366 |
| 18 | 2424 |
| 19 | -3192 |
| 20 | 9319 |
| 21 | -32687 |
| 22 | 96858 |
| 23 | -238410 |
| 24 | 508290 |
| 25 | -998065 |
| 26 | 1925065 |
| 27 | -3750685 |
| 28 | 7162328 |
| 29 | -12635545 |
| 30 | 19437562 |
| 31 | -24482990 |
| 32 | 22154946 |
| 33 | -6283107 |
| 34 | -25823457 |
| 35 | 69598597 |
| 36 | -113006459 |
| 37 | 140737910 |
| 38 | -137007218 |
| 39 | 67953174 |