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 | -2 |
| 4 | 10 |
| 5 | -25 |
| 6 | 49 |
| 7 | -84 |
| 8 | 132 |
| 9 | -195 |
| 10 | 275 |
| 11 | -374 |
| 12 | 494 |
| 13 | -637 |
| 14 | 805 |
| 15 | -1000 |
| 16 | 1224 |
| 17 | -1479 |
| 18 | 1767 |
| 19 | -2090 |
| 20 | 2450 |
| 21 | -2849 |
| 22 | 3289 |
| 23 | -3772 |
| 24 | 4300 |
| 25 | -4875 |
| 26 | 5499 |
| 27 | -6174 |
| 28 | 6902 |
| 29 | -7685 |
| 30 | 8525 |
| 31 | -9424 |
| 32 | 10384 |
| 33 | -11407 |
| 34 | 12495 |
| 35 | -13650 |
| 36 | 14874 |
| 37 | -16169 |
| 38 | 17537 |
| 39 | -18980 |
| 40 | 20500 |
| 41 | -22099 |
| 42 | 23779 |