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 | 1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | -2 |
| 7 | 5 |
| 8 | -4 |
| 9 | 1 |
| 10 | 9 |
| 11 | -24 |
| 12 | 22 |
| 13 | -8 |
| 14 | 1 |
| 15 | -88 |
| 16 | 239 |
| 17 | -228 |
| 18 | 92 |
| 19 | -16 |
| 20 | 1 |
| 21 | 1802 |
| 22 | -4920 |
| 23 | 4749 |
| 24 | -1976 |
| 25 | 376 |
| 26 | -32 |
| 27 | 1 |
| 28 | -75598 |
| 29 | 206727 |
| 30 | -200240 |
| 31 | 84086 |
| 32 | -16432 |
| 33 | 1520 |
| 34 | -64 |
| 35 | 1 |
| 36 | 6421599 |
| 37 | -17568408 |
| 38 | 17034964 |
| 39 | -7173240 |
| 40 | 1413084 |
| 41 | -133984 |
| 42 | 6112 |
| 43 | -128 |
| 44 | 1 |