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 | 11 |
| 1 | 33 |
| 2 | 99 |
| 3 | 297 |
| 4 | 891 |
| 5 | 2673 |
| 6 | 8019 |
| 7 | 24057 |
| 8 | 72171 |
| 9 | 216513 |
| 10 | 649539 |
| 11 | 1948617 |
| 12 | 5845851 |
| 13 | 17537553 |
| 14 | 52612659 |
| 15 | 157837977 |
| 16 | 473513931 |
| 17 | 1420541793 |
| 18 | 4261625379 |
| 19 | 12784876137 |
| 20 | 38354628411 |
| 21 | 115063885233 |
| 22 | 345191655699 |
| 23 | 1035574967097 |
| 24 | 3106724901291 |
| 25 | 9320174703873 |