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) |
|---|---|
| 6 | 1 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 923 |
| 13 | 3430 |
| 14 | 6004 |
| 15 | 10008 |
| 16 | 16014 |
| 17 | 24750 |
| 18 | 17153135 |
| 19 | 139520497 |
| 20 | 747544744 |
| 21 | 2907714483 |
| 22 | 9788905840 |
| 23 | 30236892651 |
| 24 | 2389382438831 |
| 25 | 33146052783575 |
| 26 | 291048293120402 |
| 27 | 2033077226586965 |
| 28 | 11881137473504364 |
| 29 | 61473838487159979 |
| 30 | 1656802388288612691 |