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 | 10 |
| 5 | -9 |
| 6 | 1 |
| 7 | 28 |
| 8 | -504 |
| 9 | 477 |
| 10 | 1 |
| 11 | 55 |
| 12 | -4158 |
| 13 | 78705 |
| 14 | -74601 |
| 15 | 1 |
| 16 | 91 |
| 17 | -18018 |
| 18 | 1432431 |
| 19 | -27154764 |
| 20 | 25740261 |
| 21 | 1 |
| 22 | 136 |
| 23 | -55692 |
| 24 | 11595870 |
| 25 | -923261976 |
| 26 | 17503377480 |
| 27 | -16591655817 |
| 28 | 1 |
| 29 | 190 |
| 30 | -139536 |
| 31 | 60087690 |
| 32 | -12529983960 |
| 33 | 997692516360 |
| 34 | -18914487631380 |
| 35 | 17929265150637 |