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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 26 |
| 5 | 72 |
| 6 | 192 |
| 7 | 496 |
| 8 | 1248 |
| 9 | 3072 |
| 10 | 7424 |
| 11 | 17664 |
| 12 | 41472 |
| 13 | 96256 |
| 14 | 221184 |
| 15 | 503808 |
| 16 | 1130496 |
| 17 | 2555904 |
| 18 | 5701632 |