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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 1 |
| 5 | 21 |
| 6 | 9 |
| 7 | 45 |
| 8 | 225 |
| 9 | 357 |
| 10 | 761 |
| 11 | 1757 |
| 12 | 2641 |
| 13 | 5013 |
| 14 | 489 |
| 15 | 18829 |
| 16 | 28609 |
| 17 | 11973 |
| 18 | 59865 |
| 19 | 37181 |
| 20 | 185905 |
| 21 | 929525 |
| 22 | 2550473 |
| 23 | 4363757 |
| 24 | 13430177 |
| 25 | 42021 |
| 26 | 33764537 |
| 27 | 34604957 |
| 28 | 38807057 |
| 29 | 194035285 |
| 30 | 433305513 |