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 | 2 |
| 2 | 4 |
| 3 | -2 |
| 4 | -24 |
| 5 | -38 |
| 6 | 44 |
| 7 | 278 |
| 8 | 336 |
| 9 | -718 |
| 10 | -3116 |
| 11 | -2642 |
| 12 | 10296 |
| 13 | 33802 |
| 14 | 16124 |
| 15 | -136762 |
| 16 | -354144 |
| 17 | -24478 |
| 18 | 1721764 |
| 19 | 3565918 |
| 20 | -1476984 |
| 21 | -20783558 |
| 22 | -34182196 |
| 23 | 35553398 |
| 24 | 242017776 |
| 25 | 306268562 |
| 26 | -597551756 |
| 27 | -2726446322 |
| 28 | -2465133864 |
| 29 | 8701963882 |
| 30 | 29729597084 |
| 31 | 15949374758 |