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 | 2 |
| 2 | -1 |
| 3 | 5 |
| 4 | -5 |
| 5 | 1 |
| 6 | 10 |
| 7 | -20 |
| 8 | 9 |
| 9 | -1 |
| 10 | 44 |
| 11 | -100 |
| 12 | 62 |
| 13 | -14 |
| 14 | 1 |
| 15 | 104 |
| 16 | -328 |
| 17 | 330 |
| 18 | -128 |
| 19 | 20 |
| 20 | -1 |
| 21 | 656 |
| 22 | -2208 |
| 23 | 2476 |
| 24 | -1176 |
| 25 | 263 |
| 26 | -27 |
| 27 | 1 |
| 28 | 2624 |
| 29 | -10144 |
| 30 | 13992 |
| 31 | -8880 |
| 32 | 2804 |
| 33 | -452 |
| 34 | 35 |
| 35 | -1 |
| 36 | 15744 |
| 37 | -66112 |
| 38 | 102384 |
| 39 | -75760 |
| 40 | 29512 |
| 41 | -6336 |
| 42 | 744 |
| 43 | -44 |
| 44 | 1 |
| 45 | 67584 |