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 | -6 |
| 4 | -7 |
| 5 | 3 |
| 6 | 36 |
| 7 | 55 |
| 8 | -9 |
| 9 | -221 |
| 10 | -373 |
| 11 | -18 |
| 12 | 1290 |
| 13 | 2506 |
| 14 | 643 |
| 15 | -7488 |
| 16 | -16487 |
| 17 | -7258 |
| 18 | 42577 |
| 19 | 106701 |
| 20 | 65695 |
| 21 | -236923 |
| 22 | -681856 |
| 23 | -534130 |
| 24 | 1282512 |
| 25 | 4304675 |
| 26 | 4079414 |
| 27 | -6687222 |
| 28 | -26866199 |
| 29 | -29871373 |
| 30 | 33019148 |
| 31 | 165771711 |
| 32 | 212092381 |
| 33 | -149113958 |
| 34 | -1010995614 |