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 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 36 |
| 4 | 121 |
| 5 | 401 |
| 6 | 1331 |
| 7 | 4414 |
| 8 | 14641 |
| 9 | 48558 |
| 10 | 161051 |
| 11 | 534145 |
| 12 | 1771561 |
| 13 | 5875603 |
| 14 | 19487171 |
| 15 | 64631634 |
| 16 | 214358881 |
| 17 | 710947978 |
| 18 | 2357947691 |
| 19 | 7820427766 |
| 20 | 25937424601 |
| 21 | 86024705429 |
| 22 | 285311670611 |