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 | 4 |
| 1 | 4 |
| 2 | -3 |
| 3 | 5 |
| 4 | -6 |
| 5 | 4 |
| 6 | 3 |
| 7 | -15 |
| 8 | 25 |
| 9 | -10 |
| 10 | -84 |
| 11 | 369 |
| 12 | -1067 |
| 13 | 2610 |
| 14 | -5824 |
| 15 | 12246 |
| 16 | -24622 |
| 17 | 47577 |
| 18 | -88233 |
| 19 | 155962 |
| 20 | -259086 |
| 21 | 393455 |
| 22 | -512281 |
| 23 | 456609 |
| 24 | 191219 |
| 25 | -2396571 |
| 26 | 8213890 |
| 27 | -21761143 |
| 28 | 50923029 |
| 29 | -110269263 |
| 30 | 225991429 |
| 31 | -444168664 |
| 32 | 844390152 |
| 33 | -1561482492 |
| 34 | 2817844569 |