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 | 2 |
| 3 | -1 |
| 4 | -10 |
| 5 | 3 |
| 6 | -1 |
| 7 | 26 |
| 8 | -33 |
| 9 | 4 |
| 10 | -1 |
| 11 | -54 |
| 12 | 207 |
| 13 | -76 |
| 14 | 5 |
| 15 | -1 |
| 16 | 96 |
| 17 | -993 |
| 18 | 824 |
| 19 | -145 |
| 20 | 6 |
| 21 | -1 |
| 22 | -156 |
| 23 | 4047 |
| 24 | -6736 |
| 25 | 2375 |
| 26 | -246 |
| 27 | 7 |
| 28 | -1 |
| 29 | 236 |
| 30 | -14769 |
| 31 | 46184 |
| 32 | -28985 |
| 33 | 5634 |
| 34 | -385 |
| 35 | 8 |
| 36 | -1 |
| 37 | -340 |
| 38 | 49743 |
| 39 | -280408 |
| 40 | 293575 |
| 41 | -95166 |
| 42 | 11711 |
| 43 | -568 |
| 44 | 9 |
| 45 | -1 |
| 46 | 470 |
| 47 | -157617 |
| 48 | 1556672 |
| 49 | -2609465 |
| 50 | 1322334 |
| 51 | -260449 |
| 52 | 22112 |
| 53 | -801 |
| 54 | 10 |