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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | -1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | -4 |
| 12 | 3 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | -30 |
| 17 | 48 |
| 18 | -19 |
| 19 | 0 |
| 20 | -36 |
| 21 | -136 |
| 22 | 468 |
| 23 | -408 |
| 24 | -35 |
| 25 | -180 |
| 26 | -115 |
| 27 | 3108 |
| 28 | -5694 |
| 29 | 2648 |
| 30 | -321 |
| 31 | 1664 |
| 32 | 14634 |
| 33 | -51628 |
| 34 | 54367 |
| 35 | -18404 |
| 36 | 16323 |
| 37 | 46544 |
| 38 | -371630 |
| 39 | 662344 |
| 40 | -459346 |
| 41 | 222776 |
| 42 | -55089 |
| 43 | -2137044 |
| 44 | 6329946 |