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 | 3 |
| 1 | 8 |
| 2 | 22 |
| 3 | 62 |
| 4 | 176 |
| 5 | 502 |
| 6 | 1434 |
| 7 | 4100 |
| 8 | 11726 |
| 9 | 33542 |
| 10 | 95952 |
| 11 | 274494 |
| 12 | 785266 |
| 13 | 2246484 |
| 14 | 6426742 |
| 15 | 18385646 |
| 16 | 52597744 |
| 17 | 150471910 |
| 18 | 430470890 |
| 19 | 1231493604 |