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 | 6 |
| 3 | 16 |
| 4 | 42 |
| 5 | 110 |
| 6 | 288 |
| 7 | 761 |
| 8 | 2020 |
| 9 | 5388 |
| 10 | 14417 |
| 11 | 38681 |
| 12 | 103994 |
| 13 | 280032 |
| 14 | 755031 |
| 15 | 2037848 |
| 16 | 5504884 |
| 17 | 14880978 |
| 18 | 40250609 |
| 19 | 108926101 |
| 20 | 294902398 |
| 21 | 798703663 |
| 22 | 2163878141 |