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 | 0 |
| 3 | -3 |
| 4 | 8 |
| 5 | -15 |
| 6 | 24 |
| 7 | -35 |
| 8 | 48 |
| 9 | -63 |
| 10 | 80 |
| 11 | -99 |
| 12 | 120 |
| 13 | -143 |
| 14 | 168 |
| 15 | -195 |
| 16 | 224 |
| 17 | -255 |
| 18 | 288 |
| 19 | -323 |
| 20 | 360 |
| 21 | -399 |
| 22 | 440 |
| 23 | -483 |
| 24 | 528 |
| 25 | -575 |
| 26 | 624 |
| 27 | -675 |
| 28 | 728 |
| 29 | -783 |
| 30 | 840 |
| 31 | -899 |
| 32 | 960 |
| 33 | -1023 |
| 34 | 1088 |
| 35 | -1155 |
| 36 | 1224 |
| 37 | -1295 |
| 38 | 1368 |
| 39 | -1443 |
| 40 | 1520 |
| 41 | -1599 |
| 42 | 1680 |
| 43 | -1763 |
| 44 | 1848 |
| 45 | -1935 |
| 46 | 2024 |
| 47 | -2115 |
| 48 | 2208 |
| 49 | -2303 |
| 50 | 2400 |