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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 45 |
| 5 | 54 |
| 6 | 63 |
| 7 | 540 |
| 8 | 405 |
| 9 | 810 |
| 10 | 13365 |
| 11 | 20412 |
| 12 | 331695 |
| 13 | 306180 |
| 14 | 65610 |
| 15 | 29160 |
| 16 | 6506325 |
| 17 | 2296350 |
| 18 | 4363065 |
| 19 | 757795500 |
| 20 | 22733865 |
| 21 | 90935460 |
| 22 | 203719050 |
| 23 | 9672226200 |
| 24 | 403009425 |
| 25 | 4836113100 |
| 26 | 22320522 |
| 27 | 2232052200 |
| 28 | 267009244425 |
| 29 | 6313519080 |
| 30 | 3425084100900 |
| 31 | 112696315578000 |
| 32 | 3018651310125 |