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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 9 |
| 7 | 1 |
| 8 | 0 |
| 9 | 74 |
| 10 | 33 |
| 11 | 1 |
| 12 | 1170 |
| 13 | 1 |
| 14 | 129 |
| 15 | 15101 |
| 16 | 0 |
| 17 | 1 |
| 18 | 187758 |
| 19 | 1 |
| 20 | 67650 |
| 21 | 615700 |
| 22 | 2049 |
| 23 | 1 |
| 24 | 4793490 |
| 25 | 3247204 |
| 26 | 8193 |
| 27 | 262658 |
| 28 | 4227330 |
| 29 | 1 |
| 30 | 480000312 |
| 31 | 1 |
| 32 | 0 |
| 33 | 2458463380 |
| 34 | 131073 |
| 35 | 10787055277 |
| 36 | 19903096980 |
| 37 | 1 |
| 38 | 524289 |
| 39 | 67117058 |
| 40 | 567489872400 |
| 41 | 1 |
| 42 | 2686322969514 |
| 43 | 1 |