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 | 5 |
| 2 | 29 |
| 3 | 185 |
| 4 | 1241 |
| 5 | 8525 |
| 6 | 59189 |
| 7 | 412865 |
| 8 | 2885681 |
| 9 | 20186645 |
| 10 | 141267149 |
| 11 | 988751945 |
| 12 | 6920909321 |
| 13 | 48445302365 |
| 14 | 339113927909 |
| 15 | 2373787929425 |
| 16 | 16616486808161 |
| 17 | 116315321563685 |
| 18 | 814206992665469 |
| 19 | 5699448173817305 |
| 20 | 39896134892198201 |