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) |
|---|---|
| 4 | 0 |
| 5 | 14 |
| 6 | 124 |
| 7 | 601 |
| 8 | 2120 |
| 9 | 6096 |
| 10 | 15168 |
| 11 | 33858 |
| 12 | 69432 |
| 13 | 132990 |
| 14 | 240812 |
| 15 | 415987 |
| 16 | 690352 |
| 17 | 1106768 |
| 18 | 1721760 |
| 19 | 2608548 |
| 20 | 3860496 |
| 21 | 5595006 |
| 22 | 7957884 |
| 23 | 11128205 |
| 24 | 15323704 |
| 25 | 20806720 |
| 26 | 27890720 |
| 27 | 36947430 |
| 28 | 48414600 |
| 29 | 62804430 |
| 30 | 80712684 |