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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 109 |
| 6 | 984 |
| 7 | 4833 |
| 8 | 17216 |
| 9 | 50778 |
| 10 | 127440 |
| 11 | 290514 |
| 12 | 599904 |
| 13 | 1172679 |
| 14 | 2138920 |
| 15 | 3744147 |
| 16 | 6268512 |
| 17 | 10184228 |
| 18 | 15922368 |
| 19 | 24423156 |
| 20 | 36328992 |
| 21 | 53149041 |
| 22 | 76127736 |
| 23 | 107316085 |
| 24 | 148241856 |
| 25 | 203111358 |
| 26 | 273647888 |
| 27 | 364606470 |
| 28 | 479946816 |
| 29 | 626565195 |