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 | 1 |
| 1 | 9 |
| 2 | 63 |
| 3 | 231 |
| 4 | 945 |
| 5 | 1890 |
| 6 | 3465 |
| 7 | 5775 |
| 8 | 12285 |
| 9 | 10395 |
| 10 | 20790 |
| 11 | 60060 |
| 12 | 45045 |
| 13 | 75075 |
| 14 | 98175 |
| 15 | 103950 |
| 16 | 176715 |
| 17 | 135135 |
| 18 | 225225 |
| 19 | 270270 |
| 20 | 405405 |
| 21 | 900900 |
| 22 | 1060290 |
| 23 | 810810 |
| 24 | 765765 |
| 25 | 675675 |
| 26 | 1354815 |
| 27 | 1351350 |
| 28 | 1711710 |
| 29 | 2702700 |
| 30 | 2027025 |
| 31 | 4542615 |
| 32 | 2297295 |
| 33 | 3378375 |
| 34 | 5360355 |
| 35 | 6216210 |
| 36 | 3828825 |
| 37 | 6774075 |
| 38 | 10270260 |