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 | 114 |
| 4 | 351 |
| 5 | 1162 |
| 6 | 3633 |
| 7 | 11067 |
| 8 | 33994 |
| 9 | 103972 |
| 10 | 315900 |
| 11 | 959469 |
| 12 | 2913192 |
| 13 | 8833205 |
| 14 | 26769585 |
| 15 | 81116398 |
| 16 | 245729000 |
| 17 | 744251550 |
| 18 | 2253989395 |
| 19 | 6825832650 |
| 20 | 20669704173 |
| 21 | 62589261963 |
| 22 | 189520870122 |
| 23 | 573861525576 |
| 24 | 1737611142984 |
| 25 | 5261327251049 |