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 | 2 |
| 5 | 4 |
| 6 | 7 |
| 7 | 0 |
| 8 | 3 |
| 9 | 10 |
| 10 | 26 |
| 11 | 60 |
| 12 | 130 |
| 13 | 38 |
| 14 | 173 |
| 15 | 485 |
| 16 | 175 |
| 17 | 977 |
| 18 | 273 |
| 19 | 2789 |
| 20 | 2065 |
| 21 | 336 |
| 22 | 15149 |
| 23 | 22718 |
| 24 | 39800 |
| 25 | 5226 |
| 26 | 54214 |
| 27 | 2323 |
| 28 | 251416 |
| 29 | 418400 |
| 30 | 93831 |
| 31 | 977776 |
| 32 | 1518664 |
| 33 | 261912 |
| 34 | 5208104 |
| 35 | 2557037 |
| 36 | 3549042 |
| 37 | 21177270 |
| 38 | 11203146 |
| 39 | 36247269 |
| 40 | 87596844 |
| 41 | 44950918 |
| 42 | 261069681 |