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 | 1 |
| 2 | 3 |
| 3 | 1 |
| 4 | 15 |
| 5 | 5 |
| 6 | 63 |
| 7 | 1 |
| 8 | 177 |
| 9 | 89 |
| 10 | 913 |
| 11 | -319 |
| 12 | 4095 |
| 13 | 2393 |
| 14 | 10617 |
| 15 | 1 |
| 16 | 65535 |
| 17 | 8897 |
| 18 | 262143 |
| 19 | -44287 |
| 20 | 729537 |
| 21 | 543553 |
| 22 | 4015777 |
| 23 | -1753087 |
| 24 | 15622785 |
| 25 | 11162969 |
| 26 | 46358529 |
| 27 | -1452031 |
| 28 | 265390977 |
| 29 | -2270911 |
| 30 | 1073741823 |
| 31 | 1 |
| 32 | 2668569153 |
| 33 | 2862962009 |
| 34 | 15344762817 |
| 35 | -8238350335 |
| 36 | 68103158337 |
| 37 | 45811586393 |