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 | 1 |
| 5 | 0 |
| 6 | -2 |
| 7 | -5 |
| 8 | -9 |
| 9 | -13 |
| 10 | -10 |
| 11 | 10 |
| 12 | 60 |
| 13 | 155 |
| 14 | 281 |
| 15 | 325 |
| 16 | 5 |
| 17 | -1214 |
| 18 | -4094 |
| 19 | -8786 |
| 20 | -12571 |
| 21 | -5642 |
| 22 | 35339 |
| 23 | 149264 |
| 24 | 363838 |
| 25 | 596714 |
| 26 | 417156 |
| 27 | -1373639 |
| 28 | -7048541 |
| 29 | -18932245 |
| 30 | -34095357 |
| 31 | -29271979 |
| 32 | 68706873 |
| 33 | 413250742 |
| 34 | 1193425228 |
| 35 | 2293494882 |
| 36 | 2201716631 |