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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -1 |
| 8 | -6 |
| 9 | -12 |
| 10 | -32 |
| 11 | -59 |
| 12 | -134 |
| 13 | -244 |
| 14 | -519 |
| 15 | -948 |
| 16 | -1949 |
| 17 | -3586 |
| 18 | -7225 |
| 19 | -13397 |
| 20 | -26640 |
| 21 | -49744 |
| 22 | -98024 |
| 23 | -184114 |
| 24 | -360455 |
| 25 | -680247 |
| 26 | -1325397 |
| 27 | -2510702 |
| 28 | -4874298 |
| 29 | -9260629 |
| 30 | -17929771 |
| 31 | -34142684 |
| 32 | -65967689 |
| 33 | -125841523 |
| 34 | -242755543 |
| 35 | -463720287 |
| 36 | -893457507 |
| 37 | -1708515146 |