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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | -30 |
| 11 | 124 |
| 12 | -336 |
| 13 | 734 |
| 14 | -1401 |
| 15 | 2404 |
| 16 | -3485 |
| 17 | 2212 |
| 18 | 14630 |
| 19 | -105408 |
| 20 | 497131 |
| 21 | -1995782 |
| 22 | 7265342 |
| 23 | -24576128 |
| 24 | 77966104 |
| 25 | -231218343 |
| 26 | 626012198 |
| 27 | -1430352680 |
| 28 | 1894959964 |
| 29 | 6114950887 |
| 30 | -73791743479 |
| 31 | 472896657475 |
| 32 | -2523776826105 |
| 33 | 12272646042530 |