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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | -5 |
| 7 | -8 |
| 8 | -5 |
| 9 | 13 |
| 10 | 57 |
| 11 | 117 |
| 12 | 110 |
| 13 | -179 |
| 14 | -1089 |
| 15 | -2591 |
| 16 | -2852 |
| 17 | 4370 |
| 18 | 30383 |
| 19 | 77884 |
| 20 | 88638 |
| 21 | -165233 |
| 22 | -1133248 |
| 23 | -2963659 |
| 24 | -3172087 |
| 25 | 8519500 |
| 26 | 53092522 |
| 27 | 135857134 |
| 28 | 122296383 |
| 29 | -543728791 |
| 30 | -2983007603 |
| 31 | -7219203443 |
| 32 | -4427302115 |
| 33 | 40439842811 |
| 34 | 194091075002 |