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 | 1 |
| 2 | -1 |
| 3 | -1 |
| 4 | 3 |
| 5 | -2 |
| 6 | -3 |
| 7 | 8 |
| 8 | -5 |
| 9 | -7 |
| 10 | 18 |
| 11 | -12 |
| 12 | -15 |
| 13 | 38 |
| 14 | -24 |
| 15 | -30 |
| 16 | 75 |
| 17 | -46 |
| 18 | -57 |
| 19 | 140 |
| 20 | -86 |
| 21 | -104 |
| 22 | 252 |
| 23 | -152 |
| 24 | -183 |
| 25 | 439 |
| 26 | -262 |
| 27 | -313 |
| 28 | 744 |
| 29 | -442 |
| 30 | -522 |
| 31 | 1232 |
| 32 | -725 |
| 33 | -852 |
| 34 | 1998 |
| 35 | -1168 |
| 36 | -1365 |
| 37 | 3182 |
| 38 | -1852 |
| 39 | -2150 |
| 40 | 4986 |
| 41 | -2886 |
| 42 | -3336 |
| 43 | 7700 |
| 44 | -4436 |
| 45 | -5106 |
| 46 | 11736 |
| 47 | -6736 |
| 48 | -7719 |
| 49 | 17673 |
| 50 | -10103 |
| 51 | -11538 |
| 52 | 26322 |