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 | -3 |
| 5 | -1 |
| 6 | 5 |
| 7 | 23 |
| 8 | 29 |
| 9 | -33 |
| 10 | -139 |
| 11 | -217 |
| 12 | 13 |
| 13 | 943 |
| 14 | 1765 |
| 15 | -1545 |
| 16 | -8963 |
| 17 | -11265 |
| 18 | 6229 |
| 19 | 73671 |
| 20 | 126701 |
| 21 | -65713 |
| 22 | -567611 |
| 23 | -793449 |
| 24 | 415197 |
| 25 | 4231583 |
| 26 | 7471669 |
| 27 | -4933529 |
| 28 | -37928499 |
| 29 | -52823313 |
| 30 | 28920485 |
| 31 | 346647351 |
| 32 | 610476733 |
| 33 | -316142785 |
| 34 | -2913394667 |
| 35 | -4922323705 |