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 | 20 |
| 2 | 272 |
| 3 | 4948 |
| 4 | 73568 |
| 5 | 1049588 |
| 6 | 14382480 |
| 7 | 192100836 |
| 8 | 2516546784 |
| 9 | 32481770852 |
| 10 | 414339126768 |
| 11 | 5234937372516 |
| 12 | 65617049910368 |
| 13 | 816985376286500 |
| 14 | 10114119489148976 |
| 15 | 124593533629907540 |
| 16 | 1528232910934667360 |