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 | 6 |
| 12 | -6 |
| 13 | 0 |
| 14 | 0 |
| 15 | 8 |
| 16 | 42 |
| 17 | -114 |
| 18 | 66 |
| 19 | 24 |
| 20 | 123 |
| 21 | 134 |
| 22 | -1563 |
| 23 | 2262 |
| 24 | -405 |
| 25 | 846 |
| 26 | -2532 |
| 27 | -15182 |
| 28 | 47961 |
| 29 | -37992 |
| 30 | 8044 |
| 31 | -59694 |
| 32 | -57117 |
| 33 | 742394 |
| 34 | -1233840 |
| 35 | 597456 |
| 36 | -798392 |
| 37 | 1447162 |
| 38 | 7898736 |
| 39 | -27134598 |
| 40 | 27649335 |