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 | 3 |
| 3 | 33 |
| 4 | 75 |
| 5 | 2385 |
| 6 | 6345 |
| 7 | 6963 |
| 8 | 11625 |
| 9 | 18555 |
| 10 | 57825 |
| 11 | 89505 |
| 12 | 92475 |
| 13 | 265995 |
| 14 | 473625 |
| 15 | 575265 |
| 16 | 1254363 |
| 17 | 1720035 |
| 18 | 3930705 |
| 19 | 4295763 |
| 20 | 4638603 |
| 21 | 5686875 |
| 22 | 6662115 |
| 23 | 8731875 |
| 24 | 8782515 |
| 25 | 13964025 |
| 26 | 14951385 |
| 27 | 17714475 |
| 28 | 18979035 |
| 29 | 21868875 |
| 30 | 26854155 |
| 31 | 45546345 |