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 | 3 |
| 3 | 6 |
| 4 | 18 |
| 5 | 36 |
| 6 | 108 |
| 7 | 159 |
| 8 | 180 |
| 9 | 540 |
| 10 | 648 |
| 11 | 1026 |
| 12 | 1077 |
| 13 | 1617 |
| 14 | 1818 |
| 15 | 2049 |
| 16 | 3075 |
| 17 | 3888 |
| 18 | 6156 |
| 19 | 6930 |
| 20 | 7128 |
| 21 | 7668 |
| 22 | 9717 |
| 23 | 14577 |
| 24 | 18465 |
| 25 | 23328 |
| 26 | 23757 |
| 27 | 35637 |
| 28 | 42120 |
| 29 | 42768 |
| 30 | 46329 |
| 31 | 56373 |
| 32 | 70956 |
| 33 | 85212 |
| 34 | 97197 |
| 35 | 145797 |
| 36 | 218697 |
| 37 | 276048 |
| 38 | 314925 |
| 39 | 367413 |
| 40 | 672624 |
| 41 | 1008936 |