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 | -2 |
| 3 | 1 |
| 4 | 7 |
| 5 | -6 |
| 6 | 1 |
| 7 | -35 |
| 8 | 40 |
| 9 | -12 |
| 10 | 1 |
| 11 | 228 |
| 12 | -315 |
| 13 | 130 |
| 14 | -20 |
| 15 | 1 |
| 16 | -1834 |
| 17 | 2908 |
| 18 | -1485 |
| 19 | 320 |
| 20 | -30 |
| 21 | 1 |
| 22 | 17582 |
| 23 | -30989 |
| 24 | 18508 |
| 25 | -5005 |
| 26 | 665 |
| 27 | -42 |
| 28 | 1 |
| 29 | -195866 |
| 30 | 375611 |
| 31 | -253400 |
| 32 | 81088 |
| 33 | -13650 |
| 34 | 1232 |
| 35 | -56 |
| 36 | 1 |
| 37 | 2487832 |
| 38 | -5112570 |
| 39 | 3805723 |
| 40 | -1389612 |
| 41 | 279048 |
| 42 | -32130 |
| 43 | 2100 |
| 44 | -72 |
| 45 | 1 |