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 | 1 |
| 3 | 1231 |
| 4 | 32521 |
| 5 | 424537 |
| 6 | 4079713 |
| 7 | 33702403 |
| 8 | 257404033 |
| 9 | 1885866973 |
| 10 | 13515603289 |
| 11 | 95750388631 |
| 12 | 674299155193 |
| 13 | 4734193668289 |
| 14 | 33187816266097 |
| 15 | 232479450595819 |
| 16 | 1627911123290065 |
| 17 | 11397233380815013 |
| 18 | 79786797746740777 |
| 19 | 558527947985495935 |