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 | 20 |
| 2 | 401 |
| 3 | 8040 |
| 4 | 161201 |
| 5 | 3232060 |
| 6 | 64802401 |
| 7 | 1299280080 |
| 8 | 26050404001 |
| 9 | 522307360100 |
| 10 | 10472197606001 |
| 11 | 209966259480120 |
| 12 | 4209797387208401 |
| 13 | 84405914003648140 |
| 14 | 1692328077460171201 |
| 15 | 33930967463207072160 |
| 16 | 680311677341601614401 |