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 | -4 |
| 6 | -8 |
| 7 | -10 |
| 8 | 2 |
| 9 | 40 |
| 10 | 115 |
| 11 | 174 |
| 12 | 22 |
| 13 | -736 |
| 14 | -2495 |
| 15 | -4276 |
| 16 | -920 |
| 17 | 20593 |
| 18 | 75011 |
| 19 | 135814 |
| 20 | 17524 |
| 21 | -788871 |
| 22 | -2909061 |
| 23 | -5248648 |
| 24 | 623274 |
| 25 | 38581252 |
| 26 | 138036877 |
| 27 | 235567666 |
| 28 | -134440249 |
| 29 | -2284840691 |
| 30 | -7698637124 |
| 31 | -11745925435 |
| 32 | 15869626983 |
| 33 | 157479613343 |