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 | 2 |
| 2 | 9 |
| 3 | 36 |
| 4 | 135 |
| 5 | 486 |
| 6 | 1701 |
| 7 | 5832 |
| 8 | 19683 |
| 9 | 65610 |
| 10 | 216513 |
| 11 | 708588 |
| 12 | 2302911 |
| 13 | 7440174 |
| 14 | 23914845 |
| 15 | 76527504 |
| 16 | 243931419 |
| 17 | 774840978 |
| 18 | 2453663097 |
| 19 | 7748409780 |
| 20 | 24407490807 |
| 21 | 76709256822 |
| 22 | 240588123669 |
| 23 | 753145430616 |
| 24 | 2353579470675 |
| 25 | 7343167948506 |
| 26 | 22876792454961 |