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 | 9 |
| 3 | 77 |
| 4 | 543 |
| 5 | 3213 |
| 6 | 16673 |
| 7 | 86093 |
| 8 | 503815 |
| 9 | 3529057 |
| 10 | 25402097 |
| 11 | 162303510 |
| 12 | 884504882 |
| 13 | 4156234265 |
| 14 | 17270407962 |
| 15 | 65375131342 |
| 16 | 232901619970 |
| 17 | 807191392546 |
| 18 | 2795912956450 |
| 19 | 9796747697594 |
| 20 | 34556445906044 |
| 21 | 120898966116007 |
| 22 | 413105921852769 |
| 23 | 1363586516014222 |