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 | 1 |
| 1 | -4 |
| 2 | 12 |
| 3 | -32 |
| 4 | 76 |
| 5 | -168 |
| 6 | 352 |
| 7 | -704 |
| 8 | 1356 |
| 9 | -2532 |
| 10 | 4600 |
| 11 | -8160 |
| 12 | 14176 |
| 13 | -24168 |
| 14 | 40512 |
| 15 | -66880 |
| 16 | 108876 |
| 17 | -174984 |
| 18 | 277932 |
| 19 | -436640 |
| 20 | 679032 |
| 21 | -1046016 |
| 22 | 1597088 |
| 23 | -2418240 |
| 24 | 3632992 |
| 25 | -5417708 |
| 26 | 8022840 |
| 27 | -11802176 |
| 28 | 17252928 |
| 29 | -25070568 |
| 30 | 36223424 |
| 31 | -52053760 |
| 32 | 74414412 |