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 | 2 |
| 2 | 8 |
| 3 | 22 |
| 4 | 68 |
| 5 | 202 |
| 6 | 608 |
| 7 | 1822 |
| 8 | 5468 |
| 9 | 16402 |
| 10 | 49208 |
| 11 | 147622 |
| 12 | 442868 |
| 13 | 1328602 |
| 14 | 3985808 |
| 15 | 11957422 |
| 16 | 35872268 |
| 17 | 107616802 |
| 18 | 322850408 |
| 19 | 968551222 |
| 20 | 2905653668 |
| 21 | 8716961002 |
| 22 | 26150883008 |
| 23 | 78452649022 |
| 24 | 235357947068 |
| 25 | 706073841202 |
| 26 | 2118221523608 |
| 27 | 6354664570822 |
| 28 | 19063993712468 |