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 | 0 |
| 2 | 18 |
| 3 | 21 |
| 4 | 111 |
| 5 | 128 |
| 6 | 650 |
| 7 | 749 |
| 8 | 3791 |
| 9 | 4368 |
| 10 | 22098 |
| 11 | 25461 |
| 12 | 128799 |
| 13 | 148400 |
| 14 | 750698 |
| 15 | 864941 |
| 16 | 4375391 |
| 17 | 5041248 |
| 18 | 25501650 |
| 19 | 29382549 |
| 20 | 148634511 |
| 21 | 171254048 |
| 22 | 866305418 |
| 23 | 998141741 |
| 24 | 5049197999 |
| 25 | 5817596400 |
| 26 | 29428882578 |
| 27 | 33907436661 |
| 28 | 171524097471 |
| 29 | 197627023568 |