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 | -2 |
| 2 | 1 |
| 3 | -4 |
| 4 | 8 |
| 5 | -6 |
| 6 | 10 |
| 7 | -16 |
| 8 | 18 |
| 9 | -26 |
| 10 | 33 |
| 11 | -40 |
| 12 | 58 |
| 13 | -74 |
| 14 | 82 |
| 15 | -112 |
| 16 | 147 |
| 17 | -166 |
| 18 | 212 |
| 19 | -268 |
| 20 | 316 |
| 21 | -392 |
| 22 | 476 |
| 23 | -560 |
| 24 | 695 |
| 25 | -838 |
| 26 | 967 |
| 27 | -1184 |
| 28 | 1430 |
| 29 | -1648 |
| 30 | 1970 |
| 31 | -2352 |
| 32 | 2731 |
| 33 | -3236 |
| 34 | 3803 |
| 35 | -4404 |
| 36 | 5206 |
| 37 | -6080 |
| 38 | 6984 |
| 39 | -8192 |
| 40 | 9553 |
| 41 | -10942 |
| 42 | 12709 |
| 43 | -14736 |
| 44 | 16886 |
| 45 | -19506 |
| 46 | 22448 |
| 47 | -25648 |
| 48 | 29552 |