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 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | -1 |
| 6 | -1 |
| 7 | 0 |
| 8 | 0 |
| 9 | -1 |
| 10 | -1 |
| 11 | 4 |
| 12 | 4 |
| 13 | 4 |
| 14 | -1 |
| 15 | -1 |
| 16 | 6 |
| 17 | 10 |
| 18 | 10 |
| 19 | 6 |
| 20 | -1 |
| 21 | -1 |
| 22 | 32 |
| 23 | 38 |
| 24 | 42 |
| 25 | 38 |
| 26 | 32 |
| 27 | -1 |
| 28 | -1 |
| 29 | 56 |
| 30 | 88 |
| 31 | 94 |
| 32 | 94 |
| 33 | 88 |
| 34 | 56 |
| 35 | -1 |
| 36 | -1 |
| 37 | 278 |
| 38 | 334 |
| 39 | 366 |
| 40 | 368 |
| 41 | 366 |
| 42 | 334 |
| 43 | 278 |
| 44 | -1 |
| 45 | -1 |
| 46 | 560 |
| 47 | 838 |
| 48 | 894 |
| 49 | 922 |
| 50 | 922 |
| 51 | 894 |
| 52 | 838 |
| 53 | 560 |
| 54 | -1 |
| 55 | -1 |
| 56 | 2894 |
| 57 | 3454 |
| 58 | 3732 |
| 59 | 3784 |
| 60 | 3810 |
| 61 | 3784 |
| 62 | 3732 |
| 63 | 3454 |
| 64 | 2894 |
| 65 | -1 |