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 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 8 |
| 7 | 2 |
| 8 | -20 |
| 9 | -66 |
| 10 | -144 |
| 11 | -230 |
| 12 | -236 |
| 13 | 22 |
| 14 | 856 |
| 15 | 2610 |
| 16 | 5308 |
| 17 | 7918 |
| 18 | 7104 |
| 19 | -4150 |
| 20 | -36636 |
| 21 | -100794 |
| 22 | -193368 |
| 23 | -269342 |
| 24 | -198772 |
| 25 | 274974 |
| 26 | 1522192 |
| 27 | 3846778 |
| 28 | 6966452 |
| 29 | 8986230 |
| 30 | 4917240 |
| 31 | -14538862 |
| 32 | -61860772 |
| 33 | -145127602 |
| 34 | -248063392 |
| 35 | -292843734 |
| 36 | -90180988 |
| 37 | 692992166 |
| 38 | 2468418888 |
| 39 | 5415220546 |
| 40 | 8722746156 |
| 41 | 9258303102 |