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 | 10 |
| 2 | 58 |
| 3 | 350 |
| 4 | 2130 |
| 5 | 12990 |
| 6 | 79258 |
| 7 | 483646 |
| 8 | 2951370 |
| 9 | 18010366 |
| 10 | 109906170 |
| 11 | 670689902 |
| 12 | 4092809194 |
| 13 | 24975905246 |
| 14 | 152412637946 |
| 15 | 930080892110 |
| 16 | 5675713495690 |
| 17 | 34635399953406 |
| 18 | 211358612597658 |
| 19 | 1289792038765742 |