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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 9 |
| 18 | 315 |
| 19 | 3465 |
| 20 | 17325 |
| 21 | 45045 |
| 22 | 63063 |
| 23 | 45045 |
| 24 | 12870 |
| 25 | 0 |
| 26 | 81 |
| 27 | 6075 |
| 28 | 200340 |
| 29 | 3835755 |
| 30 | 48617415 |
| 31 | 440531784 |
| 32 | 3000152925 |
| 33 | 15896972520 |
| 34 | 67174514550 |
| 35 | 230430986514 |
| 36 | 649879542063 |
| 37 | 1519950287430 |
| 38 | 2963421671535 |
| 39 | 4828750295985 |