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 | 27 |
| 2 | 729 |
| 3 | 8635 |
| 4 | 62365 |
| 5 | 334230 |
| 6 | 1455816 |
| 7 | 5425943 |
| 8 | 17876443 |
| 9 | 53233499 |
| 10 | 145612231 |
| 11 | 370377451 |
| 12 | 884526855 |
| 13 | 1998822498 |
| 14 | 4301425736 |
| 15 | 8862298953 |
| 16 | 17560558967 |
| 17 | 33594162385 |
| 18 | 62253768525 |
| 19 | 112071502931 |
| 20 | 196491932081 |
| 21 | 336258321854 |