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 | 6 |
| 3 | 28 |
| 4 | 30 |
| 5 | 45 |
| 6 | 496 |
| 7 | 8128 |
| 8 | 16380 |
| 9 | 57720 |
| 10 | 65472 |
| 11 | 235246 |
| 12 | 683520 |
| 13 | 33550336 |
| 14 | 50426880 |
| 15 | 60945408 |
| 16 | 105553910 |
| 17 | 131297280 |
| 18 | 3052879872 |
| 19 | 8589869056 |