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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 18 |
| 10 | 261 |
| 11 | 3420 |
| 12 | 42300 |
| 13 | 504000 |
| 14 | 5850000 |
| 15 | 66600000 |
| 16 | 747000000 |
| 17 | 8279999991 |
| 18 | 90899999757 |
| 19 | 989999995383 |
| 20 | 10709999925399 |
| 21 | 115199998904070 |
| 22 | 1232999984885400 |
| 23 | 13139999800740000 |
| 24 | 139499997460650000 |
| 25 | 1475999968482900000 |
| 26 | 15569999617032000081 |