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 | -1 |
| 3 | 8 |
| 4 | -6 |
| 5 | 1 |
| 6 | 64 |
| 7 | -56 |
| 8 | 14 |
| 9 | -1 |
| 10 | 1024 |
| 11 | -960 |
| 12 | 280 |
| 13 | -30 |
| 14 | 1 |
| 15 | 32768 |
| 16 | -31744 |
| 17 | 9920 |
| 18 | -1240 |
| 19 | 62 |
| 20 | -1 |
| 21 | 2097152 |
| 22 | -2064384 |
| 23 | 666624 |
| 24 | -89280 |
| 25 | 5208 |
| 26 | -126 |
| 27 | 1 |
| 28 | 268435456 |
| 29 | -266338304 |
| 30 | 87392256 |
| 31 | -12094464 |
| 32 | 755904 |
| 33 | -21336 |
| 34 | 254 |
| 35 | -1 |
| 36 | 68719476736 |
| 37 | -68451041280 |
| 38 | 22638755840 |
| 39 | -3183575040 |
| 40 | 205605888 |
| 41 | -6217920 |