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 | 2 |
| 1 | 9 |
| 2 | 36 |
| 3 | 150 |
| 4 | 672 |
| 5 | 3185 |
| 6 | 15688 |
| 7 | 79326 |
| 8 | 408710 |
| 9 | 2135771 |
| 10 | 11285280 |
| 11 | 60168394 |
| 12 | 323185688 |
| 13 | 1746853245 |
| 14 | 9492648592 |
| 15 | 51824157994 |
| 16 | 284078305566 |
| 17 | 1562777946663 |