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 | 6 |
| 2 | 36 |
| 3 | 108 |
| 4 | 323 |
| 5 | 1058 |
| 6 | 3223 |
| 7 | 9515 |
| 8 | 28426 |
| 9 | 84486 |
| 10 | 249106 |
| 11 | 734637 |
| 12 | 2166526 |
| 13 | 6380211 |
| 14 | 18782449 |
| 15 | 55296998 |
| 16 | 162765970 |
| 17 | 479038288 |
| 18 | 1409873905 |
| 19 | 4149367138 |
| 20 | 12211531035 |
| 21 | 35938252497 |
| 22 | 105765419940 |
| 23 | 311263342522 |
| 24 | 916033572652 |
| 25 | 2695845174863 |