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 | 13 |
| 2 | 110 |
| 3 | 765 |
| 4 | 4746 |
| 5 | 27314 |
| 6 | 149052 |
| 7 | 781725 |
| 8 | 3975730 |
| 9 | 19730150 |
| 10 | 95973956 |
| 11 | 459145778 |
| 12 | 2165937060 |
| 13 | 10095323460 |
| 14 | 46566906872 |
| 15 | 212857023069 |
| 16 | 965208806082 |
| 17 | 4345780250270 |
| 18 | 19442667426420 |
| 19 | 86489687956518 |