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 | 3 |
| 2 | 8 |
| 3 | 18 |
| 4 | 40 |
| 5 | 88 |
| 6 | 192 |
| 7 | 416 |
| 8 | 896 |
| 9 | 1920 |
| 10 | 4096 |
| 11 | 8704 |
| 12 | 18432 |
| 13 | 38912 |
| 14 | 81920 |
| 15 | 172032 |
| 16 | 360448 |
| 17 | 753664 |
| 18 | 1572864 |
| 19 | 3276800 |
| 20 | 6815744 |
| 21 | 14155776 |
| 22 | 29360128 |
| 23 | 60817408 |
| 24 | 125829120 |
| 25 | 260046848 |
| 26 | 536870912 |
| 27 | 1107296256 |
| 28 | 2281701376 |
| 29 | 4697620480 |