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 | -2 |
| 5 | 3 |
| 6 | -4 |
| 7 | 5 |
| 8 | -8 |
| 9 | 12 |
| 10 | -16 |
| 11 | 22 |
| 12 | -32 |
| 13 | 45 |
| 14 | -62 |
| 15 | 87 |
| 16 | -124 |
| 17 | 175 |
| 18 | -244 |
| 19 | 343 |
| 20 | -484 |
| 21 | 679 |
| 22 | -952 |
| 23 | 1339 |
| 24 | -1884 |
| 25 | 2646 |
| 26 | -3716 |
| 27 | 5224 |
| 28 | -7342 |
| 29 | 10313 |
| 30 | -14490 |
| 31 | 20365 |
| 32 | -28618 |
| 33 | 40210 |
| 34 | -56502 |
| 35 | 79400 |
| 36 | -111570 |
| 37 | 156769 |
| 38 | -220290 |
| 39 | 309553 |
| 40 | -434974 |
| 41 | 611210 |
| 42 | -858864 |
| 43 | 1206862 |