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) |
|---|---|
| 2 | -3 |
| 3 | -1 |
| 4 | -1 |
| 5 | 16 |
| 6 | -1 |
| 7 | 28 |
| 8 | -1 |
| 9 | 40 |
| 10 | 101 |
| 11 | -1 |
| 12 | 133 |
| 13 | 76 |
| 14 | -1 |
| 15 | 88 |
| 16 | 197 |
| 17 | 221 |
| 18 | -1 |
| 19 | 253 |
| 20 | 136 |
| 21 | -1 |
| 22 | 301 |
| 23 | 160 |
| 24 | 341 |
| 25 | 554 |
| 26 | 196 |
| 27 | -1 |
| 28 | 208 |
| 29 | -1 |
| 30 | 220 |
| 31 | 1433 |
| 32 | 256 |
| 33 | 533 |
| 34 | -1 |
| 35 | 1147 |
| 36 | -1 |
| 37 | 613 |
| 38 | 637 |
| 39 | 328 |
| 40 | 677 |
| 41 | 701 |
| 42 | -1 |
| 43 | 1483 |
| 44 | -1 |
| 45 | 388 |
| 46 | -1 |
| 47 | 2044 |
| 48 | 2164 |
| 49 | 448 |
| 50 | -1 |
| 51 | 460 |
| 52 | 941 |
| 53 | -1 |
| 54 | 1963 |
| 55 | 1013 |
| 56 | 1037 |
| 57 | 1061 |
| 58 | -1 |
| 59 | 1093 |
| 60 | 556 |
| 61 | -1 |
| 62 | 2299 |
| 63 | 3593 |
| 64 | 616 |
| 65 | -1 |
| 66 | 628 |
| 67 | 3881 |