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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -3 |
| 5 | 1 |
| 6 | 2 |
| 7 | -8 |
| 8 | 6 |
| 9 | -1 |
| 10 | 6 |
| 11 | -28 |
| 12 | 29 |
| 13 | -10 |
| 14 | 1 |
| 15 | 24 |
| 16 | -124 |
| 17 | 155 |
| 18 | -75 |
| 19 | 15 |
| 20 | -1 |
| 21 | 120 |
| 22 | -668 |
| 23 | 949 |
| 24 | -565 |
| 25 | 160 |
| 26 | -21 |
| 27 | 1 |
| 28 | 720 |
| 29 | -4248 |
| 30 | 6636 |
| 31 | -4564 |
| 32 | 1610 |
| 33 | -301 |
| 34 | 28 |
| 35 | -1 |
| 36 | 5040 |
| 37 | -31176 |
| 38 | 52464 |
| 39 | -40208 |
| 40 | 16569 |
| 41 | -3892 |
| 42 | 518 |
| 43 | -36 |
| 44 | 1 |
| 45 | 40320 |
| 46 | -259488 |
| 47 | 463956 |