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 | 10 |
| 4 | 175 |
| 5 | 1131 |
| 6 | 4501 |
| 7 | 13588 |
| 8 | 34245 |
| 9 | 75925 |
| 10 | 152911 |
| 11 | 285726 |
| 12 | 502723 |
| 13 | 841855 |
| 14 | 1352625 |
| 15 | 2098216 |
| 16 | 3157801 |
| 17 | 4629033 |
| 18 | 6630715 |
| 19 | 9305650 |
| 20 | 12823671 |
| 21 | 17384851 |
| 22 | 23222893 |
| 23 | 30608700 |
| 24 | 39854125 |
| 25 | 51315901 |
| 26 | 65399751 |
| 27 | 82564678 |
| 28 | 103327435 |
| 29 | 128267175 |
| 30 | 158030281 |
| 31 | 193335376 |