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 | 3 |
| 1 | 27 |
| 2 | 195 |
| 3 | 1371 |
| 4 | 9603 |
| 5 | 67227 |
| 6 | 470595 |
| 7 | 3294171 |
| 8 | 23059203 |
| 9 | 161414427 |
| 10 | 1129900995 |
| 11 | 7909306971 |
| 12 | 55365148803 |
| 13 | 387556041627 |
| 14 | 2712892291395 |
| 15 | 18990246039771 |
| 16 | 132931722278403 |
| 17 | 930522055948827 |
| 18 | 6513654391641795 |
| 19 | 45595580741492571 |