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 | 28 |
| 2 | 405 |
| 3 | 4032 |
| 4 | 31058 |
| 5 | 197288 |
| 6 | 1075697 |
| 7 | 5174180 |
| 8 | 22396787 |
| 9 | 88562288 |
| 10 | 323686749 |
| 11 | 1103799420 |
| 12 | 3538931886 |
| 13 | 10735761372 |
| 14 | 30981056614 |
| 15 | 85436083852 |
| 16 | 226032307036 |
| 17 | 575653531156 |
| 18 | 1415485760287 |
| 19 | 3369314791024 |
| 20 | 7781762472652 |
| 21 | 17474847498496 |
| 22 | 38225466707386 |
| 23 | 81586894793272 |