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 | 3 |
| 2 | 4 |
| 3 | 9 |
| 4 | 1 |
| 5 | 18 |
| 6 | 8 |
| 7 | -9 |
| 8 | 106 |
| 9 | -237 |
| 10 | 595 |
| 11 | -1170 |
| 12 | 2276 |
| 13 | -3969 |
| 14 | 6640 |
| 15 | -10219 |
| 16 | 14655 |
| 17 | -18636 |
| 18 | 19666 |
| 19 | -12071 |
| 20 | -13056 |
| 21 | 69157 |
| 22 | -171441 |
| 23 | 332756 |
| 24 | -552099 |
| 25 | 798670 |
| 26 | -982472 |
| 27 | 901528 |
| 28 | -116173 |
| 29 | -2351795 |
| 30 | 8715186 |
| 31 | -23856153 |
| 32 | 57926066 |
| 33 | -130281007 |
| 34 | 273804642 |
| 35 | -535390274 |