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 | 193 |
| 4 | 1548 |
| 5 | 6714 |
| 6 | 21280 |
| 7 | 55395 |
| 8 | 125748 |
| 9 | 257908 |
| 10 | 489024 |
| 11 | 870885 |
| 12 | 1473340 |
| 13 | 2388078 |
| 14 | 3732768 |
| 15 | 5655559 |
| 16 | 8339940 |
| 17 | 12009960 |
| 18 | 16935808 |
| 19 | 23439753 |
| 20 | 31902444 |
| 21 | 42769570 |
| 22 | 56558880 |
| 23 | 73867563 |
| 24 | 95379988 |
| 25 | 121875804 |
| 26 | 154238400 |
| 27 | 193463725 |
| 28 | 240669468 |
| 29 | 297104598 |
| 30 | 364159264 |