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 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 135 |
| 5 | 315 |
| 6 | 585 |
| 7 | 819 |
| 8 | 1155 |
| 9 | 1365 |
| 10 | 1485 |
| 11 | 2295 |
| 12 | 4455 |
| 13 | 9009 |
| 14 | 9405 |
| 15 | 9945 |
| 16 | 11115 |
| 17 | 13923 |
| 18 | 13965 |
| 19 | 16965 |
| 20 | 33705 |
| 21 | 34335 |
| 22 | 40365 |
| 23 | 43785 |
| 24 | 43875 |
| 25 | 63063 |
| 26 | 63855 |
| 27 | 84825 |
| 28 | 90675 |
| 29 | 106425 |
| 30 | 108927 |
| 31 | 130815 |
| 32 | 209385 |
| 33 | 236115 |
| 34 | 262845 |
| 35 | 387387 |
| 36 | 396495 |
| 37 | 397575 |
| 38 | 449295 |
| 39 | 483945 |