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 | -1 |
| 5 | 2 |
| 6 | 1 |
| 7 | -2 |
| 8 | 1 |
| 9 | -8 |
| 10 | 1 |
| 11 | -10 |
| 12 | 11 |
| 13 | -4 |
| 14 | 8 |
| 15 | 1 |
| 16 | -5 |
| 17 | 29 |
| 18 | -5 |
| 19 | 8 |
| 20 | -32 |
| 21 | 1 |
| 22 | -7 |
| 23 | 7 |
| 24 | -33 |
| 25 | 26 |
| 26 | -8 |
| 27 | 6112 |
| 28 | 1 |
| 29 | -28 |
| 30 | 602 |
| 31 | -100 |
| 32 | 313 |
| 33 | -112 |
| 34 | 512 |
| 35 | -3712 |
| 36 | 1 |
| 37 | -4 |
| 38 | 70 |
| 39 | -1268 |
| 40 | 593 |
| 41 | -1816 |
| 42 | 1936 |
| 43 | -2944 |
| 44 | 362624 |
| 45 | 1 |
| 46 | -15 |
| 47 | 38 |
| 48 | -566 |
| 49 | 9681 |
| 50 | -1481 |
| 51 | 31568 |
| 52 | -960 |
| 53 | 2432 |
| 54 | -71706112 |
| 55 | 1 |
| 56 | -55 |
| 57 | 176 |
| 58 | -1606 |
| 59 | 5401 |
| 60 | -54499 |
| 61 | 290362 |
| 62 | -58864 |
| 63 | 44736 |
| 64 | -285568 |
| 65 | 3341113856 |