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 | -16 |
| 4 | 34 |
| 5 | -61 |
| 6 | 100 |
| 7 | -152 |
| 8 | 220 |
| 9 | -305 |
| 10 | 410 |
| 11 | -536 |
| 12 | 686 |
| 13 | -861 |
| 14 | 1064 |
| 15 | -1296 |
| 16 | 1560 |
| 17 | -1857 |
| 18 | 2190 |
| 19 | -2560 |
| 20 | 2970 |
| 21 | -3421 |
| 22 | 3916 |
| 23 | -4456 |
| 24 | 5044 |
| 25 | -5681 |
| 26 | 6370 |
| 27 | -7112 |
| 28 | 7910 |
| 29 | -8765 |
| 30 | 9680 |
| 31 | -10656 |
| 32 | 11696 |
| 33 | -12801 |
| 34 | 13974 |
| 35 | -15216 |
| 36 | 16530 |
| 37 | -17917 |
| 38 | 19380 |
| 39 | -20920 |
| 40 | 22540 |