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 | -5 |
| 3 | 15 |
| 4 | -30 |
| 5 | 40 |
| 6 | -26 |
| 7 | -30 |
| 8 | 125 |
| 9 | -220 |
| 10 | 245 |
| 11 | -124 |
| 12 | -180 |
| 13 | 615 |
| 14 | -1010 |
| 15 | 1085 |
| 16 | -550 |
| 17 | -705 |
| 18 | 2415 |
| 19 | -3850 |
| 20 | 3980 |
| 21 | -1926 |
| 22 | -2460 |
| 23 | 8090 |
| 24 | -12550 |
| 25 | 12715 |
| 26 | -6074 |
| 27 | -7500 |
| 28 | 24360 |
| 29 | -37150 |
| 30 | 36930 |
| 31 | -17251 |
| 32 | -21155 |
| 33 | 67380 |
| 34 | -101210 |
| 35 | 99295 |
| 36 | -45924 |
| 37 | -55305 |
| 38 | 174500 |
| 39 | -259140 |
| 40 | 251275 |
| 41 | -114750 |