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 | 11 |
| 2 | 35 |
| 3 | 107 |
| 4 | 323 |
| 5 | 971 |
| 6 | 2915 |
| 7 | 8747 |
| 8 | 26243 |
| 9 | 78731 |
| 10 | 236195 |
| 11 | 708587 |
| 12 | 2125763 |
| 13 | 6377291 |
| 14 | 19131875 |
| 15 | 57395627 |
| 16 | 172186883 |
| 17 | 516560651 |
| 18 | 1549681955 |
| 19 | 4649045867 |
| 20 | 13947137603 |
| 21 | 41841412811 |
| 22 | 125524238435 |
| 23 | 376572715307 |
| 24 | 1129718145923 |
| 25 | 3389154437771 |
| 26 | 10167463313315 |
| 27 | 30502389939947 |