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 | 252 |
| 2 | 1 |
| 3 | 2 |
| 4 | -1 |
| 5 | 24 |
| 6 | 5 |
| 7 | 48 |
| 8 | -1 |
| 9 | -1 |
| 10 | -1 |
| 11 | 450 |
| 12 | -1 |
| 13 | 12 |
| 14 | 15 |
| 15 | 4 |
| 16 | -1 |
| 17 | 1512 |
| 18 | -1 |
| 19 | 18 |
| 20 | -1 |
| 21 | -1 |
| 22 | 45 |
| 23 | 8118 |
| 24 | -1 |
| 25 | -1 |
| 26 | -1 |
| 27 | -1 |
| 28 | -1 |
| 29 | 840 |
| 30 | -1 |
| 31 | 30 |
| 32 | -1 |
| 33 | 10 |
| 34 | -1 |
| 35 | 6 |
| 36 | -1 |
| 37 | 1368 |
| 38 | 189 |
| 39 | -1 |
| 40 | -1 |
| 41 | 1680 |
| 42 | -1 |
| 43 | 42 |
| 44 | -1 |
| 45 | -1 |
| 46 | 231 |
| 47 | 2208 |
| 48 | -1 |
| 49 | -1 |
| 50 | -1 |
| 51 | 152 |
| 52 | -1 |
| 53 | 6942 |
| 54 | -1 |
| 55 | -1 |
| 56 | -1 |
| 57 | -1 |
| 58 | -1 |
| 59 | 27318 |
| 60 | -1 |
| 61 | 60 |