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 | 6 |
| 3 | -12 |
| 4 | 22 |
| 5 | -33 |
| 6 | 48 |
| 7 | -64 |
| 8 | 84 |
| 9 | -105 |
| 10 | 130 |
| 11 | -156 |
| 12 | 186 |
| 13 | -217 |
| 14 | 252 |
| 15 | -288 |
| 16 | 328 |
| 17 | -369 |
| 18 | 414 |
| 19 | -460 |
| 20 | 510 |
| 21 | -561 |
| 22 | 616 |
| 23 | -672 |
| 24 | 732 |
| 25 | -793 |
| 26 | 858 |
| 27 | -924 |
| 28 | 994 |
| 29 | -1065 |
| 30 | 1140 |
| 31 | -1216 |
| 32 | 1296 |
| 33 | -1377 |
| 34 | 1462 |
| 35 | -1548 |
| 36 | 1638 |
| 37 | -1729 |
| 38 | 1824 |
| 39 | -1920 |
| 40 | 2020 |
| 41 | -2121 |
| 42 | 2226 |
| 43 | -2332 |
| 44 | 2442 |
| 45 | -2553 |