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 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | -2 |
| 7 | 1 |
| 8 | 6 |
| 9 | 5 |
| 10 | -6 |
| 11 | 1 |
| 12 | 10 |
| 13 | 35 |
| 14 | 26 |
| 15 | -48 |
| 16 | 1 |
| 17 | 15 |
| 18 | 85 |
| 19 | 165 |
| 20 | -26 |
| 21 | -120 |
| 22 | 1 |
| 23 | 21 |
| 24 | 175 |
| 25 | 735 |
| 26 | 1264 |
| 27 | -36 |
| 28 | -1440 |
| 29 | 1 |
| 30 | 28 |
| 31 | 322 |
| 32 | 1960 |
| 33 | 5929 |
| 34 | 8092 |
| 35 | -1212 |
| 36 | -10080 |
| 37 | 1 |
| 38 | 36 |
| 39 | 546 |
| 40 | 4536 |
| 41 | 22449 |
| 42 | 60564 |
| 43 | 57644 |
| 44 | -24816 |
| 45 | -80640 |
| 46 | 1 |
| 47 | 45 |
| 48 | 870 |
| 49 | 9450 |
| 50 | 63273 |
| 51 | 254205 |
| 52 | 572480 |