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 | 9 |
| 3 | 90 |
| 4 | 135 |
| 5 | 945 |
| 6 | 1710 |
| 7 | 1890 |
| 8 | 4959 |
| 9 | 5670 |
| 10 | 8910 |
| 11 | 10584 |
| 12 | 11025 |
| 13 | 11934 |
| 14 | 13860 |
| 15 | 19305 |
| 16 | 21735 |
| 17 | 26334 |
| 18 | 32130 |
| 19 | 36855 |
| 20 | 44550 |
| 21 | 49140 |
| 22 | 65340 |
| 23 | 107415 |
| 24 | 138600 |
| 25 | 172080 |
| 26 | 239085 |
| 27 | 305370 |
| 28 | 351540 |
| 29 | 366795 |
| 30 | 459360 |
| 31 | 849555 |
| 32 | 873180 |
| 33 | 933660 |
| 34 | 1100385 |
| 35 | 1413720 |
| 36 | 1516410 |
| 37 | 1904175 |
| 38 | 2297295 |