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 | 5 |
| 2 | 45 |
| 3 | 315 |
| 4 | 585 |
| 5 | 2205 |
| 6 | 2925 |
| 7 | 14175 |
| 8 | 9945 |
| 9 | 17325 |
| 10 | 28665 |
| 11 | 178605 |
| 12 | 45045 |
| 13 | 190575 |
| 14 | 240975 |
| 15 | 143325 |
| 16 | 135135 |
| 17 | 3189375 |
| 18 | 225225 |
| 19 | 93002175 |
| 20 | 405405 |
| 21 | 1403325 |
| 22 | 1715175 |
| 23 | 2401245 |
| 24 | 675675 |
| 25 | 3583125 |
| 26 | 3239775 |
| 27 | 1576575 |
| 28 | 3468465 |
| 29 | 94918019805 |
| 30 | 2027025 |
| 31 | 15436575 |
| 32 | 2297295 |
| 33 | 11609325 |
| 34 | 16769025 |
| 35 | 27286875 |
| 36 | 3828825 |
| 37 | 42879375 |
| 38 | 117661005 |