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 | 2 |
| 1 | 17 |
| 2 | 107 |
| 3 | 647 |
| 4 | 3887 |
| 5 | 23327 |
| 6 | 139967 |
| 7 | 839807 |
| 8 | 5038847 |
| 9 | 30233087 |
| 10 | 181398527 |
| 11 | 1088391167 |
| 12 | 6530347007 |
| 13 | 39182082047 |
| 14 | 235092492287 |
| 15 | 1410554953727 |
| 16 | 8463329722367 |
| 17 | 50779978334207 |
| 18 | 304679870005247 |
| 19 | 1828079220031487 |