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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 18 |
| 5 | 54 |
| 6 | 189 |
| 7 | 700 |
| 8 | 2778 |
| 9 | 11486 |
| 10 | 49377 |
| 11 | 217936 |
| 12 | 984818 |
| 13 | 4533004 |
| 14 | 21198962 |
| 15 | 100471862 |
| 16 | 481754806 |
| 17 | 2333465628 |
| 18 | 11404047817 |
| 19 | 56177574628 |
| 20 | 278710061814 |
| 21 | 1391617108600 |
| 22 | 6988781174376 |
| 23 | 35283390923324 |
| 24 | 178990052273558 |
| 25 | 912019786448570 |
| 26 | 4665994686718118 |