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 | 2 |
| 3 | 8 |
| 4 | 37 |
| 5 | 184 |
| 6 | 959 |
| 7 | 5172 |
| 8 | 28641 |
| 9 | 162008 |
| 10 | 932503 |
| 11 | 5445934 |
| 12 | 32197334 |
| 13 | 192357788 |
| 14 | 1159603592 |
| 15 | 7045356104 |
| 16 | 43098733353 |
| 17 | 265240985112 |
| 18 | 1641100253735 |
| 19 | 10202295895890 |
| 20 | 63696629668980 |
| 21 | 399216722146770 |
| 22 | 2510833297584165 |