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 | 4 |
| 4 | 0 |
| 5 | -8 |
| 6 | -8 |
| 7 | 16 |
| 8 | 48 |
| 9 | 0 |
| 10 | -192 |
| 11 | -256 |
| 12 | 480 |
| 13 | 1792 |
| 14 | 320 |
| 15 | -7808 |
| 16 | -12544 |
| 17 | 19200 |
| 18 | 87808 |
| 19 | 33280 |
| 20 | -382464 |
| 21 | -720896 |
| 22 | 854016 |
| 23 | 4870144 |
| 24 | 2844160 |
| 25 | -20553728 |
| 26 | -44909568 |
| 27 | 38967296 |
| 28 | 289456128 |
| 29 | 228986880 |
| 30 | -1163309056 |
| 31 | -2932514816 |
| 32 | 1701978112 |
| 33 | 17951686656 |
| 34 | 17979965440 |