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 | 6 |
| 2 | 47 |
| 3 | 340 |
| 4 | 2397 |
| 5 | 16802 |
| 6 | 117643 |
| 7 | 823536 |
| 8 | 5764793 |
| 9 | 40353598 |
| 10 | 282475239 |
| 11 | 1977326732 |
| 12 | 13841287189 |
| 13 | 96889010394 |
| 14 | 678223072835 |
| 15 | 4747561509928 |
| 16 | 33232930569585 |
| 17 | 232630513987190 |
| 18 | 1628413597910431 |
| 19 | 11398895185373124 |
| 20 | 79792266297611981 |
| 21 | 558545864083283986 |
| 22 | 3909821048582988027 |