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 | -1 |
| 5 | -1 |
| 6 | 5 |
| 7 | -1 |
| 8 | -3 |
| 9 | -4 |
| 10 | 6 |
| 11 | -1 |
| 12 | 2 |
| 13 | -1 |
| 14 | 8 |
| 15 | -11 |
| 16 | -11 |
| 17 | -1 |
| 18 | 25 |
| 19 | -1 |
| 20 | 2 |
| 21 | -22 |
| 22 | 12 |
| 23 | -1 |
| 24 | -3 |
| 25 | -6 |
| 26 | 14 |
| 27 | -37 |
| 28 | 22 |
| 29 | -1 |
| 30 | 77 |
| 31 | -1 |
| 32 | -71 |
| 33 | -56 |
| 34 | 18 |
| 35 | -36 |
| 36 | 127 |
| 37 | -1 |
| 38 | 20 |
| 39 | -79 |
| 40 | -69 |
| 41 | -1 |
| 42 | 135 |
| 43 | -1 |
| 44 | 144 |
| 45 | -232 |
| 46 | 24 |
| 47 | -1 |
| 48 | -179 |
| 49 | -8 |
| 50 | 236 |
| 51 | -137 |
| 52 | 261 |
| 53 | -1 |
| 54 | 307 |
| 55 | -331 |
| 56 | -362 |
| 57 | -172 |
| 58 | 30 |
| 59 | -1 |
| 60 | 859 |
| 61 | -1 |
| 62 | 32 |
| 63 | -295 |
| 64 | -599 |
| 65 | -716 |
| 66 | 727 |
| 67 | -1 |
| 68 | 647 |
| 69 | -254 |
| 70 | 1247 |