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 | 0 |
| 1 | -1 |
| 2 | 11 |
| 3 | -22 |
| 4 | 42 |
| 5 | -63 |
| 6 | 93 |
| 7 | -124 |
| 8 | 164 |
| 9 | -205 |
| 10 | 255 |
| 11 | -306 |
| 12 | 366 |
| 13 | -427 |
| 14 | 497 |
| 15 | -568 |
| 16 | 648 |
| 17 | -729 |
| 18 | 819 |
| 19 | -910 |
| 20 | 1010 |
| 21 | -1111 |
| 22 | 1221 |
| 23 | -1332 |
| 24 | 1452 |
| 25 | -1573 |
| 26 | 1703 |
| 27 | -1834 |
| 28 | 1974 |
| 29 | -2115 |
| 30 | 2265 |
| 31 | -2416 |
| 32 | 2576 |
| 33 | -2737 |
| 34 | 2907 |
| 35 | -3078 |
| 36 | 3258 |
| 37 | -3439 |
| 38 | 3629 |
| 39 | -3820 |
| 40 | 4020 |
| 41 | -4221 |
| 42 | 4431 |
| 43 | -4642 |