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 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 35 |
| 9 | 1 |
| 10 | 0 |
| 11 | 0 |
| 12 | 5775 |
| 13 | 715 |
| 14 | 1 |
| 15 | 0 |
| 16 | 2627625 |
| 17 | 850850 |
| 18 | 27370 |
| 19 | 1 |
| 20 | 2546168625 |
| 21 | 1697445750 |
| 22 | 189019600 |
| 23 | 826045 |
| 24 | 4509264634876 |
| 25 | 5368172184375 |
| 26 | 1385034901250 |
| 27 | 52398292375 |
| 28 | 13189599083995050 |
| 29 | 25499891510218126 |
| 30 | 12524921737453125 |